Classification
H - Social Science
9,161
M - Music
4,834
T - Technology
3,889
D - World History
3,555
Q - Science
3,471
S - Agriculture
3,409
R - Medicine
2,573
P - Language and Literature
2,553
F - General American History
2,071
B - Philosophy, Psychology, Religion
1,789
A - General Works
1,502
L - Education
1,132
J - Political Science
1,073
K - Law
925
Z - Library Science
909
N - Fine Arts
838
G - Geography, Anthropology, Recreation
579
E - United States History
292
U - Military Science
226
C - Historical Sciences
177
V - Naval Science
76