Шифр
N - Fine Arts
41,118
T - Technology
4,061
D - World History
2,014
P - Language and Literature
1,884
Z - Library Science
992
M - Music
939
G - Geography, Anthropology, Recreation
363
B - Philosophy, Psychology, Religion
313
E - United States History
310
A - General Works
254
H - Social Science
227
F - General American History
217
Q - Science
189
C - Historical Sciences
105
J - Political Science
92
S - Agriculture
72
R - Medicine
59
L - Education
40
U - Military Science
37
K - Law
27
V - Naval Science
12