Classification
Q - Science
62
T - Technology
39
S - Agriculture
18
R - Medicine
10
D - World History
5
A - General Works
4
H - Social Science
4
P - Language and Literature
4
C - Historical Sciences
3
B - Philosophy, Psychology, Religion
2
G - Geography, Anthropology, Recreation
2
N - Fine Arts
2
Z - Library Science
2
K - Law
1
M - Music
1