Classification
P - Language and Literature
274
H - Social Science
35
Q - Science
27
T - Technology
10
B - Philosophy, Psychology, Religion
7
R - Medicine
6
D - World History
5
M - Music
5
F - General American History
4
G - Geography, Anthropology, Recreation
4
L - Education
4
C - Historical Sciences
3
J - Political Science
2
N - Fine Arts
2
S - Agriculture
2
A - General Works
1