Шифр
P - Language and Literature
23,746
Z - Library Science
1,424
D - World History
668
A - General Works
503
B - Philosophy, Psychology, Religion
418
H - Social Science
190
F - General American History
151
N - Fine Arts
132
M - Music
129
C - Historical Sciences
94
L - Education
69
G - Geography, Anthropology, Recreation
40
R - Medicine
28
Q - Science
26
E - United States History
25
S - Agriculture
21
J - Political Science
19
K - Law
16
T - Technology
13
U - Military Science
8
V - Naval Science
5