Classification
330 - Economics
44
333 - Economics of land & energy
25
304 - Factors affecting social behavior
22
610 - Medicine & health
22
370 - Education
17
320 - Political science
16
336 - Public finance
7
363 - Other social problems & services
5
380 - Commerce, communications & transportation
4
630 - Agriculture & related technologies
3
600 - Technology
2