Número de Clasificación
E - United States History
54
C - Historical Sciences
53
M - Music
26
B - Philosophy, Psychology, Religion
23
S - Agriculture
22
R - Medicine
21
P - Language and Literature
19
A - General Works
7
H - Social Science
4
L - Education
4
Q - Science
4
T - Technology
4
D - World History
2
F - General American History
2
K - Law
1
N - Fine Arts
1
U - Military Science
1