Class A - General Works
Class B - Philosophy, Psychology, Religion
Class C - Auxiliary Sciences of History (General)
Class D - General and Old World History
Class E - History of America
Class F - Local History of the United States and the Americas
Class G - Geography, Anthropology, Recreation
Class H - Social Sciences
Class I - Texts by Country
Class J - Political Science
Class K - Law
Class L - Education
Class M - Music
Class N - Fine Arts
Class P - Language and Literature
Class Q - Science
Class R - Medicine
Class S - Agriculture
Class T - Technology
Class U - Military Science
Class V - Naval Science
Class X - Wikisource
Class Z - Bibliography, Library Science