Classification
Q - Science
1,944
T - Technology
811
S - Agriculture
672
H - Social Science
420
D - World History
346
P - Language and Literature
312
R - Medicine
227
G - Geography, Anthropology, Recreation
212
A - General Works
155
Z - Library Science
135
F - General American History
99
B - Philosophy, Psychology, Religion
69
C - Historical Sciences
58
M - Music
49
L - Education
48
N - Fine Arts
32
J - Political Science
26
K - Law
17
U - Military Science
16
V - Naval Science
10
E - United States History
8