Classification
R - Medicine
69
Q - Science
63
T - Technology
49
M - Music
43
S - Agriculture
24
Z - Library Science
23
P - Language and Literature
19
D - World History
18
H - Social Science
16
L - Education
13
A - General Works
7
B - Philosophy, Psychology, Religion
7
K - Law
4
J - Political Science
3
G - Geography, Anthropology, Recreation
2