Classification
300 - Social sciences
900 - History & geography
304 - Factors affecting social behavior
3
330 - Economics
3
100 - Philosophy & psychology
2
301 - Sociology & anthropology
2
370 - Education
2
610 - Medicine & health
2
800 - Literature & rhetoric
2
200 - Religion
1
320 - Political science
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
600 - Technology
1