Classification
R - Medicine
19,061
B - Philosophy, Psychology, Religion
9,361
D - World History
3,968
A - General Works
2,813
Q - Science
1,927
T - Technology
710
P - Language and Literature
507
H - Social Science
477
C - Historical Sciences
357
G - Geography, Anthropology, Recreation
279
E - United States History
178
S - Agriculture
142
M - Music
81
Z - Library Science
77
F - General American History
69
J - Political Science
58
N - Fine Arts
58
K - Law
26
V - Naval Science
24
L - Education
12
U - Military Science
12