Número de Clasificación
Q - Science
148,111
T - Technology
126,842
H - Social Science
109,060
P - Language and Literature
79,136
D - World History
68,302
B - Philosophy, Psychology, Religion
58,058
R - Medicine
36,246
K - Law
31,139
J - Political Science
24,503
N - Fine Arts
21,767
G - Geography, Anthropology, Recreation
20,413
L - Education
15,443
S - Agriculture
13,188
M - Music
9,490
Z - Library Science
9,284
F - General American History
8,632
C - Historical Sciences
8,063
A - General Works
4,445
E - United States History
4,381
U - Military Science
4,337
V - Naval Science
1,400