Classification
D - World History
62
P - Language and Literature
55
Q - Science
32
H - Social Science
29
B - Philosophy, Psychology, Religion
28
L - Education
19
T - Technology
17
R - Medicine
14
N - Fine Arts
13
M - Music
11
S - Agriculture
9
J - Political Science
7
A - General Works
6
K - Law
5
E - United States History
3
G - Geography, Anthropology, Recreation
2
Z - Library Science
2