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