Classification
100 - Philosophy & psychology
140 - Specific philosophical schools
320 - Political science
330 - Economics
700 - The arts; fine & decorative arts
170 - Ethics
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
304 - Factors affecting social behavior
1
340 - Law
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
800 - Literature & rhetoric
1