Шифр
L - Education
1,054
D - World History
61
H - Social Science
44
Q - Science
28
T - Technology
16
G - Geography, Anthropology, Recreation
12
P - Language and Literature
12
R - Medicine
12
B - Philosophy, Psychology, Religion
8
Z - Library Science
8
K - Law
7
A - General Works
6
J - Political Science
3
N - Fine Arts
3
C - Historical Sciences
2
S - Agriculture
2
F - General American History
1