Classification
100 - Philosophy & psychology
320 - Political science
340 - Law
363 - Other social problems & services
170 - Ethics
4
140 - Specific philosophical schools
3
333 - Economics of land & energy
3
581 - Specific topics in natural history
3
700 - The arts; fine & decorative arts
3
200 - Religion
1
300 - Social sciences
1
330 - Economics
1
530 - Physics
1
900 - History & geography
1