Classification
304 - Factors affecting social behavior
320 - Political science
57
300 - Social sciences
54
900 - History & geography
28
301 - Sociology & anthropology
24
370 - Education
17
340 - Law
15
140 - Specific philosophical schools
14
330 - Economics
14
200 - Religion
12
700 - The arts; fine & decorative arts
10
361 - Social problems & social welfare in general
6
800 - Literature & rhetoric
6
100 - Philosophy & psychology
5
350 - Public administration & military science
5
400 - Language
5
170 - Ethics
4
297 - Islam, Babism & Bahai Faith
4
333 - Economics of land & energy
4
500 - Natural sciences & mathematics
4
576 - Genetics & evolution
4
610 - Medicine & health
4
380 - Commerce, communications & transportation
3
551 - Geology, hydrology & meteorology
3
770 - Photography, photographs & computer art
3
296 - Judaism
2
360 - Social problems & services; associations
2
363 - Other social problems & services
2
410 - Linguistics
2
581 - Specific topics in natural history
2
600 - Technology
2
630 - Agriculture & related technologies
2
780 - Music
2
920 - Biography, genealogy & insignia
1