Classification
H - Social Science
47
D - World History
20
Q - Science
20
S - Agriculture
19
T - Technology
18
K - Law
10
M - Music
10
A - General Works
8
N - Fine Arts
7
R - Medicine
6
J - Political Science
5
L - Education
5
Z - Library Science
3
B - Philosophy, Psychology, Religion
2
G - Geography, Anthropology, Recreation
1
U - Military Science
1