Número de Clasificación
H - Social Science
23
P - Language and Literature
20
D - World History
12
G - Geography, Anthropology, Recreation
12
Q - Science
10
S - Agriculture
9
B - Philosophy, Psychology, Religion
8
L - Education
6
N - Fine Arts
6
F - General American History
5
Z - Library Science
5
C - Historical Sciences
4
K - Law
4
T - Technology
4
J - Political Science
3
A - General Works
2
E - United States History
2
M - Music
2
R - Medicine
2