Classification
100 - Philosophy & psychology
140 - Specific philosophical schools
3
170 - Ethics
370 - Education
900 - History & geography
340 - Law
2
200 - Religion
1
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
363 - Other social problems & services
1
600 - Technology
1