Library of Congress Classification System: Main Classes

Curious about how the Library of Congress Classification system organizes materials in a collection?  Do you see your area of study below?  Listed here are the letters and titles of the main classes of the LC system.

Click on any class to view an outline of its subclasses.

• A - General

  General Encyclopedias, Almanacs

• B - Philosophy, Psychology, & Religions

  Also includes Ethics, Logic, and Mythology

• C - Auxiliary Sciences of History

  Archaeology, Genealogy, Heraldry, Numismatics (coins & currency)

• D - World History

  Histories of Europe, Asia, Africa, Australia, New Zealand, etc.

• E & F - History of the Americas

  USA, Canada, Latin America & the Caribbean

• G - Geography, Anthropology

  Also includes Folklore, Environmental Sciences, Leisure/Recreation, Oceanography

• H - Social Sciences

  Business, Demography, Economics, Sociology, Statistics

• J - Political Science

  Colonies/Colonization, Government, International Law, Political Institutions, Public Administration

• K - Law

  Also includes Religious Law

• L - Education

  All aspects of Education from history of to practice at all levels

• M - Music

  Compositions, History and Literature of Music, Instruction and Study

• N - Fine Arts

  Architecture, Decorative Arts, Design, Drawing and Painting, Sculpture, Visual and Print

• P - Language and Literature

  Classical and Modern Languages, Literature, Poetry, Philology/Linguistics

• Q - Sciences

  Including all the Natural Sciences, Mathematics, Natural History

• R - Medicine

  All Medical specialties, Homeopathy, Nursing, Pharmacy, Public Health

• S - Agriculture

  Aquaculture/Fishing, Forestry, Hunting, Plant Culture

• T - Technology

  Including Arts & Crafts/Handicrafts, Chemical Technology, Construction, Engineering, Home Economics, Metallurgy, Motor Vehicles, Photography

• U - Military Science

  Armies: Organization, Maintenance, etc.

• V - Naval Science

  Marines, Navies: Organization, Navigation, Shipbuilding

• Z - Bibliography

  Books: Industry & Trade, Information Resources, Libraries, Paleography, Writing