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Library of Congress Classification

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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 university libraries in the U.S. and several other countries - most public libraries continue to use the Dewey Decimal Classification (DDC).

The classification was originally developed by Herbert Putnam with the advice of Charles Ammi Cutter in 1897 before he assumed the librarianship of Congress. It was influenced by Cutter Expansive Classification, DDC, and was designed for the use by the Library of Congress. The new system replaced a fixed location system developed by Thomas Jefferson. By the time of Putnam's departure from his post in 1939 all the classes except K (Law) and parts of B (Philosophy and Religion) were well developed. It has been criticized as lacking a sound theoretical basis; many of the classification decisions were driven by the particular practical needs of that library, rather than considerations of epistemological elegance.

Although it divides subjects into broad categories, it is essentially enumerative in nature.

The National Library of Medicine classification system (NLM) uses unused letters W and late Qs. Some libraries use NLM in conjuction with LCC, not using LCC's R (Medicine).

AGENERAL WORKS
BPHILOSOPHY. PSYCHOLOGY. RELIGION
CAUXILIARY SCIENCES OF HISTORY
DHISTORY: GENERAL AND OLD WORLD
EHISTORY: AMERICA
   This class is not broken down into letter sub-classes.
11-143 America
151-889United States
FHISTORY: AMERICA
   This class is not broken down into letter sub-classes.
1-975 United States local history
1001-1145.2British America (including Canada)
Dutch America
1170French America
1201-3799Latin America, Spanish America and History of Brazil.
GGEOGRAPHY. ANTHROPOLOGY. RECREATION
HSOCIAL SCIENCES
JPOLITICAL SCIENCE
KLAW
LEDUCATION
MMUSIC AND BOOKS ON MUSIC
NFINE ARTS
PLANGUAGE AND LITERATURE
QSCIENCE
RMEDICINE
SAGRICULTURE
TTECHNOLOGY
UMILITARY SCIENCE
VNAVAL SCIENCE
ZBIBLIOGRAPHY. LIBRARY SCIENCE. INFORMATION RESOURCES (GENERAL)

Letter classes I, O, W, X and Y are not standardly used.

External links

fr:Classification de la Bibliothque du Congrs it:Classificazione della Library of Congress zh:美国国会图书馆图书分类法

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