Classification
P - Language and Literature
3,681
T - Technology
161
Q - Science
121
E - United States History
72
M - Music
28
C - Historical Sciences
24
D - World History
14
F - General American History
14
H - Social Science
13
N - Fine Arts
9
G - Geography, Anthropology, Recreation
7
A - General Works
6
B - Philosophy, Psychology, Religion
6
Z - Library Science
5
S - Agriculture
3
L - Education
2
U - Military Science
2
K - Law
1
R - Medicine
1