Klassifikationsnummer
D - World History
15
H - Social Science
13
P - Language and Literature
6
G - Geography, Anthropology, Recreation
5
T - Technology
2
A - General Works
1
B - Philosophy, Psychology, Religion
1
C - Historical Sciences
1
J - Political Science
1
L - Education
1
M - Music
1
R - Medicine
1
U - Military Science
1