Classification
P - Language and Literature
12,905
M - Music
11,796
D - World History
9,967
F - General American History
8,375
B - Philosophy, Psychology, Religion
5,099
R - Medicine
3,538
H - Social Science
2,656
E - United States History
2,289
A - General Works
2,216
C - Historical Sciences
1,274
Z - Library Science
1,212
J - Political Science
1,084
Q - Science
845
K - Law
769
T - Technology
609
N - Fine Arts
577
L - Education
434
S - Agriculture
290
G - Geography, Anthropology, Recreation
289
U - Military Science
204
V - Naval Science
59