Número de Clasificación
P - Language and Literature
17,816
H - Social Science
11,661
B - Philosophy, Psychology, Religion
10,268
D - World History
6,896
Q - Science
5,197
K - Law
3,902
J - Political Science
3,546
N - Fine Arts
2,228
E - United States History
1,867
G - Geography, Anthropology, Recreation
1,854
R - Medicine
1,648
T - Technology
1,610
F - General American History
1,525
L - Education
1,296
M - Music
1,111
Z - Library Science
884
C - Historical Sciences
513
U - Military Science
484
S - Agriculture
391
A - General Works
181
V - Naval Science
43