Classification
R - Medicine
19,062
B - Philosophy, Psychology, Religion
9,371
D - World History
4,024
A - General Works
2,820
Q - Science
2,207
T - Technology
758
P - Language and Literature
544
H - Social Science
510
C - Historical Sciences
366
G - Geography, Anthropology, Recreation
305
E - United States History
183
S - Agriculture
150
Z - Library Science
87
M - Music
83
F - General American History
71
J - Political Science
64
N - Fine Arts
59
K - Law
27
V - Naval Science
24
U - Military Science
15
L - Education
13