Classification
R - Medicine
38
D - World History
29
T - Technology
17
H - Social Science
16
Q - Science
15
S - Agriculture
12
N - Fine Arts
10
Z - Library Science
9
B - Philosophy, Psychology, Religion
6
G - Geography, Anthropology, Recreation
6
P - Language and Literature
5
A - General Works
4
F - General American History
3
L - Education
3
C - Historical Sciences
2
E - United States History
2
J - Political Science
2
K - Law
1
M - Music
1