Classification
330 - Economics
11
320 - Political science
3
361 - Social problems & social welfare in general
2
900 - History & geography
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
360 - Social problems & services; associations
1
363 - Other social problems & services
1
370 - Education
1
380 - Commerce, communications & transportation
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
700 - The arts; fine & decorative arts
1