Classification
H - Social Science
14,963
M - Music
10,669
T - Technology
7,480
Q - Science
7,050
R - Medicine
6,362
S - Agriculture
5,916
D - World History
5,310
P - Language and Literature
3,359
A - General Works
3,275
B - Philosophy, Psychology, Religion
2,609
K - Law
2,380
F - General American History
2,374
L - Education
2,261
J - Political Science
1,827
Z - Library Science
1,559
G - Geography, Anthropology, Recreation
1,250
N - Fine Arts
1,235
E - United States History
459
C - Historical Sciences
435
U - Military Science
321
V - Naval Science
133