Classification
P - Language and Literature
1,149
Q - Science
271
S - Agriculture
38
R - Medicine
30
B - Philosophy, Psychology, Religion
27
H - Social Science
16
D - World History
13
G - Geography, Anthropology, Recreation
11
N - Fine Arts
11
T - Technology
7
K - Law
5
C - Historical Sciences
3
J - Political Science
2
L - Education
2
M - Music
2
Z - Library Science
2
U - Military Science
1