Classification
P - Language and Literature
17,247
Q - Science
406
K - Law
293
H - Social Science
262
B - Philosophy, Psychology, Religion
135
D - World History
94
R - Medicine
93
N - Fine Arts
45
G - Geography, Anthropology, Recreation
32
T - Technology
29
L - Education
28
M - Music
27
J - Political Science
25
S - Agriculture
18
U - Military Science
5
Z - Library Science
5
F - General American History
4
E - United States History
3
A - General Works
2
C - Historical Sciences
1
V - Naval Science
1