Número de Clasificación
T - Technology
1,011
M - Music
238
C - Historical Sciences
18
B - Philosophy, Psychology, Religion
9
G - Geography, Anthropology, Recreation
8
A - General Works
6
D - World History
4
F - General American History
4
P - Language and Literature
4
R - Medicine
3
S - Agriculture
2
E - United States History
1
V - Naval Science
1