Classification
R - Medicine
4,865
D - World History
1,890
B - Philosophy, Psychology, Religion
1,275
Q - Science
1,197
H - Social Science
908
A - General Works
478
T - Technology
326
G - Geography, Anthropology, Recreation
319
F - General American History
285
S - Agriculture
284
E - United States History
222
Z - Library Science
175
J - Political Science
162
P - Language and Literature
162
C - Historical Sciences
126
N - Fine Arts
98
K - Law
90
L - Education
70
M - Music
61
U - Military Science
21
V - Naval Science
17