Número de Clasificación
D - World History
49
H - Social Science
19
L - Education
8
T - Technology
7
K - Law
6
P - Language and Literature
6
R - Medicine
6
N - Fine Arts
3
C - Historical Sciences
2
Q - Science
2
A - General Works
1
B - Philosophy, Psychology, Religion
1
G - Geography, Anthropology, Recreation
1
J - Political Science
1
M - Music
1