Classification
100 - Philosophy & psychology
140 - Specific philosophical schools
340 - Law
900 - History & geography
300 - Social sciences
3
320 - Political science
3
170 - Ethics
2
301 - Sociology & anthropology
2
330 - Economics
2
361 - Social problems & social welfare in general
2
370 - Education
2
600 - Technology
2
304 - Factors affecting social behavior
1
360 - Social problems & services; associations
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
610 - Medicine & health
1
620 - Engineering & allied operations
1