Número de Clasificación
M - Music
381,644
P - Language and Literature
19,842
C - Historical Sciences
16,993
S - Agriculture
14,790
D - World History
4,666
R - Medicine
4,652
L - Education
3,880
B - Philosophy, Psychology, Religion
2,946
A - General Works
2,563
G - Geography, Anthropology, Recreation
2,111
N - Fine Arts
2,102
E - United States History
1,738
H - Social Science
1,072
T - Technology
989
F - General American History
866
K - Law
818
V - Naval Science
727
Q - Science
672
J - Political Science
554
Z - Library Science
539
U - Military Science
104