Classification
D - World History
68
R - Medicine
68
B - Philosophy, Psychology, Religion
63
P - Language and Literature
59
Q - Science
41
A - General Works
32
F - General American History
31
H - Social Science
12
S - Agriculture
11
T - Technology
8
G - Geography, Anthropology, Recreation
7
C - Historical Sciences
6
N - Fine Arts
5
Z - Library Science
5
E - United States History
4
M - Music
4
L - Education
3
U - Military Science
2
J - Political Science
1
K - Law
1