Classification
100 - Philosophy & psychology
2
170 - Ethics
300 - Social sciences
320 - Political science
370 - Education
140 - Specific philosophical schools
1
200 - Religion
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
330 - Economics
1
340 - Law
1
600 - Technology
1
900 - History & geography
1