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The Library of Congress Classification (LCC) is a system of library classification developed by the Library of Congress. It is used by most research and academic libraries in the U.S. and several other countries; in these countries, most public libraries and small academic libraries continue to use the older Dewey Decimal Classification (DDC). LCC should not be confused with LCCN, the system of Library of Congress Control Numbers assigned to all books (and authors), which also defines URLs of their online catalog entries, such as "82006074" and " The classification was invented by Herbert Putnam in 1897, just before he assumed the librarianship of Congress. With advice from Charles Ammi Cutter, it was influenced by his Cutter Expansive Classification, the Dewey Decimal System, and the Putnam Classification System (developed while Putnam was head librarian at the Minneapolis Public Library).〔Claire Kelley. ("A library classification system that’s older than the Dewey Decimal and Library of Congress models". )〕〔Andy Sturdevant. ("Cracking the spine on Hennepin County Library's many hidden charms". ) ''MinnPost'', 02/05/14.〕 It was designed specifically for the purposes and collection of the Library of Congress to replace the fixed location system developed by Thomas Jefferson. By the time Putnam departed from his post in 1939, all the classes except K (Law) and parts of B (Philosophy and Religion) were well developed. LCC has been criticized for lacking a sound theoretical basis; many of the classification decisions were driven by the practical needs of that library rather than epistemological considerations. Although it divides subjects into broad categories, it is essentially enumerative in nature. That is, it provides a guide to the books actually in one library's collections, not a classification of the world. The National Library of Medicine classification system (NLM) uses the initial letters ''W'' and ''QS''–''QZ'', which are not used by LCC. Some libraries use NLM in conjunction with LCC, eschewing LCC's ''R'' for Medicine. Others use LCC's ''QP''–''QR'' schedules and include Medicine ''R''.〔Taylor, A. G., & Joudrey, D.N. (2009). The organization of information. 3rd ed. Englewood: Libraries Unlimited.〕〔Chan, L. M.(2007). Cataloguing and classification: An introduction. 3rd ed. Scarecrow Press.〕 == Classification == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Library of Congress Classification」の詳細全文を読む スポンサード リンク
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