Classification
301 - Sociology & anthropology
330 - Economics
300 - Social sciences
9
900 - History & geography
5
320 - Political science
4
304 - Factors affecting social behavior
2
333 - Economics of land & energy
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
340 - Law
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
581 - Specific topics in natural history
1
610 - Medicine & health
1