Each class corresponds to a letter of the alphabet.


A General Works
B Philosophy-Religion-Psychology
C History (Civilization)
D History (Except America)
E American History
F Local American history, Latin American History
G Geography and Anthropology
H Social Sciences
J Political Science
K Law
M Music
N Fine Arts
P Language and Linguistics
Q Science and math
R Medicine
S Agriculture
T Technology
U Military Science
V Naval Science
Z Bibliography and Library Science

, As with the Dewey Decimal System, the more numbers and letters contained in a call number, the more specific the classification is—and the easier it is to find or shelve the book. The LC call number “PS3537 A426 C3 1951,” identifies the “Catcher in the Rye,” by J. D. Salinger, which was published in 1951 (the last four numbers in the call number.)
Learn the 20 classifications the Library of Congress uses to separate areas of knowledge.
Read more about how each class is further subdivided into subclasses, using a combination of letters and numbers.
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