Classification
P - Language and Literature
6,717
H - Social Science
1,271
K - Law
1,245
D - World History
573
Q - Science
540
F - General American History
317
N - Fine Arts
260
B - Philosophy, Psychology, Religion
218
J - Political Science
200
M - Music
152
L - Education
128
R - Medicine
108
S - Agriculture
101
G - Geography, Anthropology, Recreation
97
T - Technology
70
Z - Library Science
60
A - General Works
32
U - Military Science
23
C - Historical Sciences
21
E - United States History
9
V - Naval Science
4