Classification
H - Social Science
36
A - General Works
34
T - Technology
34
Q - Science
31
D - World History
27
R - Medicine
16
S - Agriculture
15
L - Education
12
P - Language and Literature
12
K - Law
11
G - Geography, Anthropology, Recreation
8
Z - Library Science
7
N - Fine Arts
6
B - Philosophy, Psychology, Religion
4
V - Naval Science
3
M - Music
2