Classification
P - Language and Literature
101
Q - Science
35
S - Agriculture
27
D - World History
22
H - Social Science
15
R - Medicine
13
G - Geography, Anthropology, Recreation
6
M - Music
4
C - Historical Sciences
3
J - Political Science
3
K - Law
3
L - Education
3
N - Fine Arts
3
A - General Works
2
T - Technology
2
B - Philosophy, Psychology, Religion
1
U - Military Science
1