Classification
320 - Political science
330 - Economics
233
900 - History & geography
30
800 - Literature & rhetoric
20
340 - Law
13
700 - The arts; fine & decorative arts
10
300 - Social sciences
7
576 - Genetics & evolution
7
100 - Philosophy & psychology
6
400 - Language
6
140 - Specific philosophical schools
5
200 - Religion
5
410 - Linguistics
5
170 - Ethics
4
297 - Islam, Babism & Bahai Faith
4
630 - Agriculture & related technologies
3
780 - Music
2
301 - Sociology & anthropology
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
398 - Folklore
1
600 - Technology
1
770 - Photography, photographs & computer art
1