Classification
140 - Specific philosophical schools
2
200 - Religion
2
900 - History & geography
2
300 - Social sciences
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
320 - Political science
1
330 - Economics
1
333 - Economics of land & energy
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
581 - Specific topics in natural history
1
600 - Technology
1
610 - Medicine & health
1