CLASSIFICATION
L - Education
35,796
T - Technology
4,013
E - United States History
220
H - Social Science
209
M - Music
137
S - Agriculture
118
N - Fine Arts
96
C - Historical Sciences
46
U - Military Science
44
G - Geography, Anthropology, Recreation
33
D - World History
28
Q - Science
24
B - Philosophy, Psychology, Religion
21
J - Political Science
21
R - Medicine
19
P - Language and Literature
15
V - Naval Science
15
K - Law
13
Z - Library Science
6
A - General Works
3
F - General American History
3