Classification
170 - Ethics
200 - Religion
900 - History & geography
100 - Philosophy & psychology
3
140 - Specific philosophical schools
3
320 - Political science
2
300 - Social sciences
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
370 - Education
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1