Classification
P - Language and Literature
2,667
S - Agriculture
24
Q - Science
21
H - Social Science
12
B - Philosophy, Psychology, Religion
7
R - Medicine
7
K - Law
4
N - Fine Arts
3
D - World History
2
J - Political Science
2
T - Technology
2
G - Geography, Anthropology, Recreation
1
L - Education
1
Z - Library Science
1