Classification
200 - Religion
320 - Political science
370 - Education
6
330 - Economics
5
700 - The arts; fine & decorative arts
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
170 - Ethics
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
900 - History & geography
1