Classification
100 - Philosophy & psychology
320 - Political science
333 - Economics of land & energy
363 - Other social problems & services
6
581 - Specific topics in natural history
5
700 - The arts; fine & decorative arts
4
140 - Specific philosophical schools
3
170 - Ethics
3
330 - Economics
3
340 - Law
3
900 - History & geography
3
200 - Religion
2
300 - Social sciences
2
576 - Genetics & evolution
2
610 - Medicine & health
2
301 - Sociology & anthropology
1
350 - Public administration & military science
1
370 - Education
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1