Número de Clasificación
B - Philosophy, Psychology, Religion
31
C - Historical Sciences
26
M - Music
21
A - General Works
17
E - United States History
15
T - Technology
8
D - World History
7
H - Social Science
3
K - Law
3
L - Education
2
R - Medicine
2
S - Agriculture
2
Z - Library Science
2
N - Fine Arts
1
P - Language and Literature
1