Classification
D - World History
12
A - General Works
7
Q - Science
7
T - Technology
7
S - Agriculture
6
H - Social Science
4
K - Law
4
P - Language and Literature
4
G - Geography, Anthropology, Recreation
2
R - Medicine
2
B - Philosophy, Psychology, Religion
1
C - Historical Sciences
1
L - Education
1
M - Music
1
N - Fine Arts
1
Z - Library Science
1