Classification
P - Language and Literature
158,856
M - Music
34,277
F - General American History
7,292
Q - Science
5,179
B - Philosophy, Psychology, Religion
5,035
D - World History
4,902
H - Social Science
4,803
A - General Works
3,956
R - Medicine
2,971
K - Law
2,795
C - Historical Sciences
2,523
N - Fine Arts
1,857
J - Political Science
1,457
T - Technology
1,262
E - United States History
1,185
S - Agriculture
1,059
G - Geography, Anthropology, Recreation
613
L - Education
454
Z - Library Science
414
U - Military Science
161
V - Naval Science
43