Classification
P - Language and Literature
249
H - Social Science
184
Q - Science
168
S - Agriculture
112
T - Technology
39
R - Medicine
30
G - Geography, Anthropology, Recreation
29
L - Education
22
D - World History
15
B - Philosophy, Psychology, Religion
9
J - Political Science
9
N - Fine Arts
5
K - Law
3
U - Military Science
3
M - Music
2
C - Historical Sciences
1
E - United States History
1
V - Naval Science
1