Klassifikationsnummer
Q - Science
842
B - Philosophy, Psychology, Religion
20
H - Social Science
14
L - Education
14
T - Technology
14
Z - Library Science
9
G - Geography, Anthropology, Recreation
6
F - General American History
3
N - Fine Arts
3
R - Medicine
3
A - General Works
1
C - Historical Sciences
1
J - Political Science
1
K - Law
1
P - Language and Literature
1