Classification
900 - History & geography
27
320 - Political science
8
700 - The arts; fine & decorative arts
5
780 - Music
5
300 - Social sciences
3
363 - Other social problems & services
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
200 - Religion
2
800 - Literature & rhetoric
2
170 - Ethics
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
330 - Economics
1
333 - Economics of land & energy
1
340 - Law
1
370 - Education
1