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A digital system is one that uses discrete numbers, especially binary numbers, or non-numeric symbols such as letters or icons, for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (an analog system).

The distinction of "digital" versus "analog" can refer to method of input, data storage and transfer, the internal working of an instrument, and the kind of display. The word comes from the same source as the word digit and digitus: the Latin word for finger (counting on the fingers) as these are used for discrete counting.

The word digital is most commonly used in computing and electronics, especially where real-world information is converted to binary numeric form as in digital audio and digital photography. Such data-carrying signals carry either one of two electronic or optical pulses, logic 1 (pulse present) or 0 (pulse absent). The term is often meant by the prefix "e-", as in e-mail and ebook, even though not all electronics systems are digital.

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Exhibitions - Special collections at Case Western Reserve University, including medieval manuscripts and items from the US 1930s Works Projects Administration era.

75th Anniversary of the Free Library of Philadelphia - Special collection of over 225 texts and images covering local architecture, history and African American architects.

AGF Library - Contains mainly religious and mythological books and texts with some multimedia files, using a bulletin board format.

Alexandria Digital Library Project - Digital map collections at the University of California Santa Barbara.
Meta Description: [ The Alexandria Digital Library Project is developing a globally distributed georeferenced digital library ]

American Journeys - A digital library of more than 18,000 pages of eyewitness accounts of North American exploration. A collaboration between the Wisconsin Historical Society and National History Day.
Meta Description: [ Read, search, and print this work at American Journeys, a digital library of early American exploration and settlement. Brought to you by the Wisconsin Historical Society and National History Day ]

American Memory - Site hosted by the Library of Congress as a gateway to online collections of the history and culture of the United States, totaling more than 7 million digital items.

Atmopsheric Visualization Collection - Atmospheric data collection focusing on data from the Atmospheric Radiation Measurement (ARM) program's Southern Great Plains (SGP) site, provided by the National Science Digital Library. The site includes an image archive and educational support material.

Berkeley Digital Library SunSITE - Program information, resources, and access to digital collections.

Bibliotheca Universalis - Portal to major works of worldwide cultural and scientific heritage comprising text, images and sound, at the disposal of the general public using communication and information technology.

Brigham Young University Digital Media Library - The public access interface of this online resource allows browsing or searching of university publications, including theses and the Mormon Studies Index.
Meta Description: [ Online Collections at BYU is a website to organize and make available all of the digitized collections created at Brigham Young University. Content includes multi-media, images, theses and dissertations, scholarly periodicals, and text collections. The collections are inclusive of digital collec... ]

British Library Images Online - Search, order and purchase items from the thousands of images from the library’s collections.
Meta Description: [ British Library Images Online. Use this site to search, order and purchase thousands of digitised images from the British Library's unparalleled collections. ]

California Digital Library (CDL) - Provides access to scholarly materials, databases of journal article abstracts and citations, electronic journals, publishing tools, and reference databases for the University of California. The CDL also builds collections and provides public access to cultural heritage materials though a variety of innovative programs.

Canada's Digital Collections - Collections include over 600 web sites covering Canadian history, geography, science, technology and culture, ranging from national treasures to local history. The site features educational resources, such as curriculum units, classroom activities, quizzes and games. Also available in French.

Carrie Electronic Library - Collection of full-text electronic academic works related to Asian studies.

Celtic Digital Library - Contains digital links, artwork and information about the Celtic society from 400 B.C to 1500 A.D and Celtic Reconstruction of today.

Center for Retrospective Digitization - Access to the digital collections at the Lower Saxony State and University Library Göttingen, Germany, including the Gutenberg Bible, travel literature and North Americana from the 18th and 19th centuries, DIEPER (Digitized European Periodicals), historical mathematics materials, and Goethe illustrations.
Meta Description: [ Goettinger DigitalisierungsZentrum der Staats- und Universitätsbibliothek Göttingen ]

Central and Eastern European Online Library (CEEOL) - A paid subscription service providing access to articles, scholarly journals, electronic books and re-digitized documents from cultural and scientific publications related to central and eastern Europe.
Meta Description: [ Central and Eastern European Online Library - CEE journals, documents, articles, periodicals, books available online for download, Zeitschrfitendatenbank, Online Zeitschriften, Online Zeitschriftendatenbank ]

CHILDE Project - Children's Historical Literature Disseminated throughout Europe is a project, funded under the European Commission's Culture 2000 programme, which has created a collection of images from early children's books.

CiteSeer: The NEC Research Institute Scientific Literature Digital Library - Aims to improve the dissemination and feedback of scientific literature, and to provide improvements in functionality, usability, availability, cost, comprehensiveness, efficiency, and timeliness. Rather than creating just another digital library, CiteSeer provides algorithms, techniques, and software that can be used in other digital libraries. CiteSeer indexes Postscript and PDF research articles on the Web, and provides a number of special features.
Meta Description: [ CiteSeer: Scientific Literature Digital Library incorporating autonomous citation indexing, awareness and tracking, citation context, related document retrieval, similar document identification, citation graph analysis, and query-sensitive document summaries. Advantages in terms of availability, ... ]

Colorado Digitization Project - A collaborative initiative to provide access to the unique collections of Colorado's archives, historical societies, libraries, and museums.
Meta Description: [ Collaborative Digitization Program ]

Digital Archive for Chinese Studies (DACHS) - Based at the Institute of Chinese Studies at the University of Heidelberg (Germany), the collection includes websites, e-journals, films, snapshots of discussion boards, and single documents covering social and political subject matters.

Digital Bridges - Collection of historical bridge design manuals, images and books from Lehigh University.
Meta Description: [ Bridges of the Nineteenth Century : A Twenty-First Century Book Collection ]

Digital Collections: National Library of New Zealand - Provides access to text, images, photographs, newspaper articles, audio and video collections as well as virtual exhibits. Bilingual site (Maori and English).
Meta Description: [ How to use the National Library of New Zealand’s digital collections ]

Digital Library Network for Engineering and Technology (DLNET) - A collaborative effort by the American Society for Engineering Education (ASEE), the Institute of Electrical and Electronics Engineers, Inc. (IEEE), Iowa State University (ISU) and Virginia Tech (VATECH) to provide a platform for posting, reviewing and accessing learning resources in Engineering and Technology and a gateway to education and research materials.
Meta Description: [ DLNET is a platform for posting, reviewing and accessing learning resources in Engineering and Technology. It provides a gateway to education and research materials authored and published by educators, practicing engineers and technologists, as well as professional associations, institutions and ... ]

Digital Library of Information Science and Technology (DLIST) - Developed by the School of Information Resources and Library Science and the Arizona Health Sciences Library at the University of Arizona using Open Archives Initiative (OAI) compliant Eprints v.2 software.

Digital Library Project - A University of Pennsylvania selection of digital library collections, exhibits, and finding aids prepared by digital librarians. Site includes information on tools and technology.

Digital Projects at the University of Illinois - Information and access to the digital collections at the University of Illinois at Urbana-Champaign.

Digital Research Library (DRL) - Text-based collections, photographs, map images, finding aids, databases, audio-visual material, and bibliographic catalogs of collections to aid the research of scholars, historians, faculty, and students at the University of Pittsburgh.

Digital South Asia Library - Materials related to South Asia, including maps, statistics, photographs, and official publications.
Meta Description: [ The Digital South Asia Library provides dictionaries, gazetteers, photographs, prints, drawings, maps, statistics, bibliographies, indexes, books, and journals for reference and research concerning South Asia. ]

eCUIP : The Digital Library Project - A browsable and searchable digital library of materials for K-12 teachers and students.
Meta Description: [ A browsable and searchable digital library of materials for K-12 teachers and students. ]

Ethnomathematics Digital Library - Collection of links and papers covering the interaction of mathematics and culture, with emphasis on the indigenous mathematics of the Pacific region.

Everglades Digital Library - Access to the digital collections at Florida International University. Relates to the south Florida environment.

Flora and Fauna of the Great Lakes - Provides access to materials including including books, images and databases selected from Fish and Mammal Divisions of the University of Michigan Museum of Zoology and the Fungus Collections of the University of Michigan Herbarium.

ibiblio - A collaboration of the Center for the Public Domain and The University of North Carolina - Chapel Hill to provide public domain material, organised by subject and UDC (Universal Decimal Classification) including journals, ebooks and a special collection of linux programs and documentation.

Illinois Alive - Includes text and images about agriculture and business; early Illinois authors; and issues facing minorities, immigrants, and women. Also includes an introduction to 19th century Illinois, tools for educators, and a timeline.
Meta Description: [ During the 19th century Illinois underwent an incredible transformation as it developed from a sparsely settled frontier region into a dynamic, prosperous, rural-urban state that exerted national leadership in a variety of fields. Topics included in this site are : Agriculture and Business ; Earl... ]

Images from the Heritage Collection of the State Library of Tasmania - A searchable database of images from the Heritage Collection of the State Library of Tasmania, Australia.

Indiana University Digital Library Program - Provides access to text, images, maps and audio collections as well as virtual exhibits. The site includes information on digitization projects and links to further resources.
Meta Description: [ The Indiana University Digital Library Program (DLP is dedicated to the selection, production, and maintenance of a wide range of high quality networked resources for scholars and students at Indiana University and elsewhere. ]

Internet Archive - A digital library of internet sites and other cultural artifacts in digital form. Includes a text archive of digitised books from Canadian libraries, Carnegie Mellon University, and Project Gutenberg.

Internet Moving Image Archive - A collection of hundreds of short films in MPEG-2 format

IntraText Digital Library - A multilingual, open access and XML-based digital library offering texts and corpora in 36 languages from religions, humanities, and research.
Meta Description: [ IntraText Digital Library: Full-text Digital Library committed to accuracy, accessibility and usability, offering texts and corpora as lexical hypertexts. Texts, documents and collections in 40 text languages and 6 interface languages ]

Inventory of Canadian Digital Initiatives - Provides descriptions of Canadian information resources created for the Internet, including general digital collections, resources centered around a particular theme, and reference sources and databases.
Meta Description: [ Service providing access to Canadian information resources created for the Web, including general digital collections, resources centered around a particular theme, and reference sources and databases. ]

Iran Virtual Library - Nonpartisan archive of social, political, economic and cultural documents pertaining to Iran. Edited by Frederick  Nemani, a professor at South Bank University, London.
Meta Description: [ Iran:Virtual Library, library of Iran's social, political, economic and cultural affairs ]

Kentucky Virtual Library - Online catalogs and databases, online tutorial and help with internet-based research, a virtual reference desk, and access to Kentuckiana digitized collections, serving Kentuckians and supporting the Kentucky Commonwealth Virtual University.

Kibbutz Sasa Virtual Library - Online bibliographical and image search service in Hebrew only, which also retains an expert searcher for locating online sources of information.

Library of California - Details the Library's services to local libraries, state and local government and the public as well as links to California Research Bureau papers online, LDS publications, the California Library Directory and other useful information.

Library of Virginia Digital Library Program - Provides access to multiple databases and millions of digital images of text, photographs and maps pertaining to the history and culture of Virginia.

Life in Western Pennsylvania 1840 -1970 - Historic photographic collection provided by the library and archives of the Historical Society of Western Pennsylvania. The site also covers the local history of photography and information on the care and handling of photographs.

Medieval Illuminated Manuscripts - Presents the collection of the Dutch Royal Library and the Museum Meermanno-Westreenianum in The Hague. Highlights and database with images and backgrounds.

Mylib's Knowledge Portal - A portal to on-line dictionaries and reference works. Some emphasis on Malaysian society.
Meta Description: [ MyLib is the pilot project of the proposed larger Malaysia's National Digital Library Initiative. ]

Nalanda Digital Library - Based at the National Institute of Technology, Calicut (NITC) in India. Open access is provided to selected collections of published papers, PhD theses, student projects, research reports, course materials, ebooks, etexts and Perl scripts.
Meta Description: [ Nalanda Digital Library offers eBooks in Fiction,Arts,Science&Engg from Nalanda eText Conversion Project, e-book, ebook, e book, It has a vast collection of Datasheets and Application Notes in Electronics and Computers, National Institute of Technology, Calicut ]

National Science Digital Library (NSDL) - Comprehensive source for science, technology, engineering and mathematics education. Funded by the National Science Foundation.
Meta Description: [ NSDL is the Nation's FREE online library for education and research in Science, Technology, Engineering, and Mathematics. Funded by the National Science Foundation. ]

Networked Digital Library of Theses and Dissertations (NDLTD) - Catalog of theses and doctoral dissertations hosted by Virginia Tech contributed by some 176 Universities and 27 Institutions worldwide. Some entries may include abstracts and/or full-text attachments.

New York Public Library Digital Gallery - Provides access to over 275,000 images digitized from the library collections, including illuminated manuscripts, historical maps, vintage posters, rare prints and photographs, illustrated books, and printed ephemera.

New Zealand Digital Library (NZDL) - Based at the University of Waikato, New Zealand. The site contains text, image and audio-visual collections; including historical documents, humanitarian and development information, computer science technical reports and bibliographies, literary works, and magazines.

NICI Virtual Library - The National Institute for Community Innovations is based in Montpelier, Vermont and provides a subscription service for access to dictionaries, e-books, card catalogs, periodicals, and researched internet resources.

NLS Digital Library - Special collections held by the National Library of Scotland including: The Murthly Hours medieval manuscripts, Experiences of War, Maps of Scotland, First Scottish Books, Scottish Decorative Bookbinding, Photographs of Modern Scottish Writers, Churchill, Robert Louis Stevenson, and The Last Letter of Mary Queen of Scots.

North Carolina History and Fiction Digital Library - Collection includes 200 texts and maps pertaining to the history of 29 counties in eastern North Carolina and works of fiction that relate to some of those counties. Historic soil surveys and maps with zooming capability are a unique feature of the site.

NYPL Digital Library Collections - Collections provided by the New York Public Library covering Black culture and experience, history, literature, maps, New York City and State, performing arts, prints, and photographs.

Online Bilingual Library of Russian Literature - Collection of texts and audio, including works of Pushkin, Lermontov, Fet, Krylov, Esenin, Akhmatova and Chekhov provided by the Online Russian Language Center. Texts are available in Russian and English.
Meta Description: [ Online Library of Russian classical literature offers works of Pushkin, Lermontov, Fet, Krylov, Esenin, Akhmatova, Chekhov, Tsvetaeva, Vysotsky in original and English translation for free. Selected poems are supplied with voice recordings each available in two formats: RealAudio and Flash. Он... ]

404 Online Publications at the University of Stuttgart (OPUS) - Collection of theses, dissertations, preprints, proceedings and full-text documents published in pdf format by staff and students of the University. Site also in German.

Open Content Alliance (OCA) - A group of cultural, technology, nonprofit, and governmental organizations from around the world that will help build a permanent archive of multilingual digitized text and multimedia content.

Original Sources - Electronic library with works from history, the social sciences, philosophy, literature, and religion. Fee required for access.

Perseus Digital Library - An evolving collection of resources for the study of the ancient world, including archaeology, atlas, texts and translations, text tools and lexica.

500 Persian Digital Library - Texts in Farsi for major Persian authors and poets. Site is in English.

Questia - Paid subscription service that provides access to a large online collection of books and journal articles in the humanities and social sciences, plus magazine and newspaper articles.
Meta Description: [ The World's Largest Online Library of Books plus Tens of Thousands of Journal Articles ]

Quinnipiac University: Arnold Bernhard Library Resources - E-Texts - Materials digitized by the university and links to materials available elsewhere.
Meta Description: [ Quinnipiac University - Hamden, Connecticut (203) 582-8200 ]

Sagnanetið - Saganet project by the National and University Library of Iceland and Cornell University with the association of the Árni Magnússon Institute in Iceland to provide the entire range of Icelandic family sagas and other works published before 1900 online. Site in English and Icelandic.

SAILOR: Maryland's Public Information Network - Provides public information for citizens of and visitors to Maryland, including resources for health, business, education, and history.

San Fernando Valley History Digital Library - An image database of historically significant documents, manuscripts, photographs and related graphic materials of the San Fernando Valley. Administered by the State Librarian of California.

404 Science Direct - Journals - An online library featuring fulltext journals from Academic Press and other scholarly publishers. Access by subscription.

Simon Fraser University Library Electronic Document Centre - Promotes access to knowledge created at Simon Fraser University and makes some of the Library's unique holdings available to a wider audience.

St Laurentius Digital Manuscript Library - A collection of scanned images of medieval manuscripts comprising 67 volumes, ranging from the 10th century to the 1640s provided by Lund University Library in Sweden.
Meta Description: [ Medieval manuscripts from Lund university library. The service comprises a vast collection of scanned images and a search engine for intellectual content. ]

TAEVIS Online Home Page - Tactile access to education for visually impaired students.A collection of 2,500 tactile diagrams covering college-level course.In either braille or low-vision format, for sale to subscribers

The Digital Mirror - The welsh national collection of manuscripts, early and rare printed books, antiquarian maps, and diverse images at The National Library of Wales. Site includes online exhibitions and information about the digitisation program.

The Digital Reading Room (DRR) - An Athabasca University Library project. The DRR is an interactive online reading room, offering a digital solution for course readings and supplementary materials. It has been designed to provide access to faculty-selected resources and can accommodate a range of formats, including online journal articles, electronic books, audio or video clips, web sites and learning objects.

The Gateway to Northwestern Ontario History - Collection includes photographs, books, drawings and artifacts. Site in English with French version under development.

The International Children's Digital Library (ICDL) - A 5-year project by the Internet Archive and the University of Maryland's Human-Computer Interaction Lab to develop a library using innovative software specifically for children.

The Online Archive of California - This union database of manuscripts and images from institutions across California is comprised of over 5,000 archival finding aids encoded using Encoded Archival Description (EAD) standard and the SGML document type definition. Part of the California Digital Library.

There is Such a Thing as a Free Lunch: Freely Accessible Databases for the Public - Article by Sandy Lewis containing a list of databases that produce a list of citations to scientific literature, published in Issues in Science and Technology Librarianship.

UCEEL Digital Library - Based at the University of Central England. Collections include past exam papers, book chapters, journal articles, student projects and a special collection on contemporary jewellery.

UK Web Archiving Consortium - Aimed at the broad research community and is systematically attempting to create an archive of social, historic and culturally significant web-based material from the UK domain.

University of Chicago Digital Library Activities - Text, image, audio and special collections in the humanities and the arts.

University of Michigan Digital Library Production Service - The Digital Library Production Service (DLPS) was formed in 1996 to provide infrastructure for campus digital library collections, including both access and delivery of collection content.

University of Tennessee Digital Library Center - Promotes the development of a growing collection of digital content for the University community and the State of Tennessee.
Meta Description: [ The University of Tennessee, Knoxville: University Libraries: Digital Library Center ]

University of Tennessee-Martin Andy Holt Virtual Library - Focus is on the humanities and fine arts, with access to local and world library catalogs, electronic journals, databases, virtual reference desk, digitized documents, and departmental resources. Partners with the physical Paul Meek Library to provide face to face services.

University of Texas System Digital Library - Supporting the learning and research needs of the University of Texas Telecampus and University of Texas System students and faculty on campus and at a distance.

University of Wisconsin Digital Collections - List of collections, and links to collections at various UW branches.

Uysal-Walker Archive of Turkish Oral Narrative (ATON) - Collection of written (PDF) and spoken (MP3) texts in several Turkic languages at Texas Tech University.
Meta Description: [ Archive of Turkish Oral Narrative, Texas Tech University ]

Victorian Women Writers Project - A collection of text, essays, and fiction written during the Victorian period, by women writers.

VIVA, The Virtual Library of Virginia - Information on this library consortium of shared digital collections.

Washington State Digital Library Resources - Text, image, archive and local history collections. Site includes best practice guide and Digital Imaging Initiative project pages.
Meta Description: [ The Washington State Library hosts this portal to digitized collections published by libraries in the state. The site is funded in part by the Institution for Museum and Library Services, under the Library Services and Technology Act The portal is updated with links to new library collections as... ]

Worthington Memory - Online history scrapbook of Worthington, Ohio.

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