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