Classification
Q - Science
36
R - Medicine
30
B - Philosophy, Psychology, Religion
10
C - Historical Sciences
9
Z - Library Science
9
A - General Works
6
D - World History
6
E - United States History
4
F - General American History
4
J - Political Science
4
H - Social Science
3
M - Music
3
S - Agriculture
1
T - Technology
1