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MIT OpenCourseWare ( MIT OCW) is an initiative of the Massachusetts Institute of Technology (MIT) to publish all of the educational materials from its undergraduate - and graduate-level courses online, freely and openly available to anyone, anywhere.
Docsity is an online social learning network for worldwide students and professionals. Originally launched in 2010 exclusively for Italian students, it became an international website in mid-2012 by opening to worldwide students. It is advertisement-free and user-generated.
Open educational resources ( OER) [1] are teaching, learning, and research materials intentionally created and licensed to be free for the end user to own, share, and in most cases, modify. [2] [3] The term "OER" describes publicly accessible materials and resources for any user to use, re-mix, improve, and redistribute under some licenses. [4] These are designed to reduce accessibility ...
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Online public access catalog. The online public access catalog ( OPAC ), now frequently synonymous with library catalog, is an online database of materials held by a library or group of libraries. Online catalogs have largely replaced the analog card catalogs previously used in libraries.
The Online Books Page is an index of e-text books available on the Internet. [1] It is edited by John Mark Ockerbloom and is hosted by the library of the University of Pennsylvania. [2] The Online Books Page lists over 2 million books [3] and has several features, such as A Celebration of Women Writers and Banned Books Online .
The New General Catalogue of Nebulae and Clusters of Stars (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies, star clusters and emission nebulae. Dreyer published two supplements to the NGC in 1895 and 1908, known as the Index Catalogues (abbreviated IC ), describing a further 5,386 ...
The National Union Catalog (NUC) is a printed catalog of books catalogued by the Library of Congress and other American and Canadian libraries, issued beginning in the 1950s. The National Union Catalog is divided into two series: the Pre-1956 Imprints is a 754-volume set containing all older records in a consolidated alphabetical format, while ...