Classification
Q - Science
2,203
R - Medicine
1,569
D - World History
933
P - Language and Literature
812
B - Philosophy, Psychology, Religion
577
E - United States History
199
T - Technology
196
C - Historical Sciences
164
A - General Works
134
G - Geography, Anthropology, Recreation
96
M - Music
81
F - General American History
79
H - Social Science
36
Z - Library Science
26
S - Agriculture
17