Classification
363 - Other social problems & services
320 - Political science
14
333 - Economics of land & energy
8
900 - History & geography
4
140 - Specific philosophical schools
3
300 - Social sciences
2
581 - Specific topics in natural history
2
304 - Factors affecting social behavior
1
330 - Economics
1
380 - Commerce, communications & transportation
1
610 - Medicine & health
1
720 - Architecture
1
780 - Music
1