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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.
WorldCat is a union catalog that itemizes the collections of tens of thousands of institutions (mostly libraries), in many countries, that are current or past members of the OCLC global cooperative. It is operated by OCLC, Inc. [4] Many of the OCLC member libraries collectively maintain WorldCat's database , the world's largest bibliographic ...
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]
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MIT OpenCourseWare. 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. The project was announced on April 4, 2001, [1] and uses Creative Commons ...
The Sharpless catalog is a list of 313 H II regions (emission nebulae) intended to be comprehensive north of declination −27°. (It does include some nebulae south of that declination as well.) The first edition was published in 1953 with 142 objects (Sh1), and the second and final version was published by US astronomer Stewart Sharpless in ...
The Online Books Page lists over 2 million books and has several features, such as A Celebration of Women Writers and Banned Books Online. The Online Books Page was the second substantial effort to catalog online texts, but the first to do so with the rigors required by library science. It first appeared on the Web in the summer of 1993.
Caldwell catalogue. Montage of Caldwell Catalogue objects. The Caldwell catalogue is an astronomical catalogue of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers. The list was compiled by Patrick Moore as a complement to the Messier catalogue. [1]