Classification
P - Language and Literature
65,124
Q - Science
4,992
H - Social Science
1,155
R - Medicine
1,108
T - Technology
1,077
S - Agriculture
975
B - Philosophy, Psychology, Religion
755
D - World History
343
G - Geography, Anthropology, Recreation
230
J - Political Science
148
L - Education
130
N - Fine Arts
114
K - Law
96
M - Music
93
A - General Works
87
F - General American History
41
E - United States History
29
U - Military Science
27
C - Historical Sciences
24
V - Naval Science
22
Z - Library Science
16