Classification
P - Language and Literature
5,843
Q - Science
209
H - Social Science
171
B - Philosophy, Psychology, Religion
138
R - Medicine
67
D - World History
62
N - Fine Arts
48
M - Music
24
G - Geography, Anthropology, Recreation
19
T - Technology
19
J - Political Science
10
A - General Works
9
L - Education
6
S - Agriculture
6
Z - Library Science
5
C - Historical Sciences
4
F - General American History
2
U - Military Science
2
E - United States History
1