Número de Clasificación
M - Music
28,294
P - Language and Literature
1,776
S - Agriculture
1,337
C - Historical Sciences
487
R - Medicine
349
D - World History
250
F - General American History
248
E - United States History
209
A - General Works
175
G - Geography, Anthropology, Recreation
164
H - Social Science
100
N - Fine Arts
76
T - Technology
47
B - Philosophy, Psychology, Religion
44
V - Naval Science
36
L - Education
34
K - Law
17
U - Military Science
13
J - Political Science
12
Z - Library Science
7
Q - Science
5