Classification
H - Social Science
26
T - Technology
13
S - Agriculture
12
Q - Science
10
R - Medicine
7
A - General Works
5
K - Law
4
B - Philosophy, Psychology, Religion
3
U - Military Science
3
Z - Library Science
3
D - World History
2
G - Geography, Anthropology, Recreation
2
J - Political Science
2
L - Education
1
M - Music
1