Número de Clasificación
D - World History
26,969
P - Language and Literature
8,276
H - Social Science
6,465
B - Philosophy, Psychology, Religion
5,678
K - Law
5,102
N - Fine Arts
3,456
G - Geography, Anthropology, Recreation
2,266
J - Political Science
2,107
M - Music
1,863
Z - Library Science
1,379
T - Technology
1,354
C - Historical Sciences
1,288
L - Education
823
E - United States History
624
U - Military Science
569
Q - Science
565
A - General Works
493
R - Medicine
451
S - Agriculture
344
F - General American History
66
V - Naval Science
33