Classification
P - Language and Literature
66,606
K - Law
1,795
Q - Science
917
H - Social Science
659
B - Philosophy, Psychology, Religion
529
D - World History
306
N - Fine Arts
292
R - Medicine
227
J - Political Science
174
T - Technology
164
S - Agriculture
148
L - Education
108
G - Geography, Anthropology, Recreation
78
M - Music
73
F - General American History
28
Z - Library Science
26
U - Military Science
24
A - General Works
21
C - Historical Sciences
14
E - United States History
9
V - Naval Science
6