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.It is not to be confused with the Library of Congress Subject Headings or Library of Congress Control Number. Most public libraries and small academic libraries continue to use the Dewey Decimal Classification.

The Library of Congress Classification system (LC) divides the field of knowledge into twenty large classes with an additional class on general works. This notation allows more combinations and greater specificity without long notations. The Law Library, Music Library and Asian Library use LC classification schemes for all or part of their collections.

Dewey Decimal Classification

This system organizes books on library shelves in a specific and repeatable order that makes it easy to find any book and return it to its proper place. The system is used in 200,000 libraries in at least 135 countries.

The DDC attempts to organize all knowledge into ten main classes. The ten main classes are each further subdivided into ten divisions, and each division into ten sections, giving ten main classes, 100 divisions and 1000 sections.

The system is made up of seven tables and ten main classes, each of which are divided into ten secondary classes or subcategories, each of which contain ten subdivisions.

The tables are:

standard subdivision


subdivision of individual literatures

subdivisions of individual languages

racial, ethnic, national groups



The classes are:

000 – Computer science, information and general works

100 – Philosophy and psychology

200 – Religion

300 – Social sciences

400 – Language

500 – Science (including mathematics)

600 – Technology and applied Science

700 – Arts and recreation

800 – Literature

900 – History, geography, and biography

DDC and UDC are more flexible than Library of Congress Classification because of greater use of facets (via auxiliary tables) while Library of Congress Classification is almost totally enumerative.

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