Classification
M - Music
163,774
P - Language and Literature
116,369
F - General American History
35,977
D - World History
6,881
H - Social Science
6,347
A - General Works
5,760
S - Agriculture
5,277
B - Philosophy, Psychology, Religion
3,748
N - Fine Arts
1,942
R - Medicine
1,538
J - Political Science
1,351
K - Law
961
L - Education
936
E - United States History
888
Q - Science
536
T - Technology
503
Z - Library Science
478
G - Geography, Anthropology, Recreation
394
U - Military Science
391
C - Historical Sciences
197
V - Naval Science
59