Classification
100 - Philosophy & psychology
170 - Ethics
363 - Other social problems & services
900 - History & geography
320 - Political science
2
333 - Economics of land & energy
2
140 - Specific philosophical schools
1
200 - Religion
1
330 - Economics
1
361 - Social problems & social welfare in general
1
370 - Education
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1