Classification
P - Language and Literature
7,152
R - Medicine
170
Q - Science
32
B - Philosophy, Psychology, Religion
7
H - Social Science
5
C - Historical Sciences
4
D - World History
2
G - Geography, Anthropology, Recreation
2
M - Music
2
S - Agriculture
2
E - United States History
1
F - General American History
1
K - Law
1