Classification
Q - Science
205
T - Technology
193
B - Philosophy, Psychology, Religion
138
R - Medicine
47
H - Social Science
32
S - Agriculture
27
G - Geography, Anthropology, Recreation
21
Z - Library Science
11
V - Naval Science
7
E - United States History
4
A - General Works
1
C - Historical Sciences
1
D - World History
1
P - Language and Literature
1