Número de Clasificación
P - Language and Literature
112
T - Technology
76
C - Historical Sciences
49
B - Philosophy, Psychology, Religion
36
A - General Works
17
H - Social Science
16
E - United States History
14
S - Agriculture
9
M - Music
7
Z - Library Science
4
N - Fine Arts
3
J - Political Science
2
D - World History
1
K - Law
1
Q - Science
1
U - Military Science
1