Classification
P - Language and Literature
13,927
Q - Science
274
B - Philosophy, Psychology, Religion
180
D - World History
134
H - Social Science
103
S - Agriculture
54
M - Music
52
R - Medicine
49
G - Geography, Anthropology, Recreation
47
L - Education
38
K - Law
36
J - Political Science
31
N - Fine Arts
28
T - Technology
16
Z - Library Science
8
A - General Works
6
F - General American History
5
E - United States History
4
C - Historical Sciences
2
U - Military Science
2