Número de Clasificación
D - World History
71,077
J - Political Science
47,760
F - General American History
17,873
H - Social Science
16,522
E - United States History
9,370
M - Music
6,418
B - Philosophy, Psychology, Religion
4,857
P - Language and Literature
4,295
K - Law
4,185
A - General Works
2,628
Z - Library Science
1,764
T - Technology
1,499
U - Military Science
997
L - Education
741
S - Agriculture
671
C - Historical Sciences
523
G - Geography, Anthropology, Recreation
506
N - Fine Arts
321
R - Medicine
164
Q - Science
129
V - Naval Science
45