Classification
300 - Social sciences
304 - Factors affecting social behavior
320 - Political science
330 - Economics
3
370 - Education
900 - History & geography
100 - Philosophy & psychology
2
600 - Technology
2
140 - Specific philosophical schools
1
170 - Ethics
1
200 - Religion
1
301 - Sociology & anthropology
1
340 - Law
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
550 - Earth sciences
1