Classification
320 - Political science
330 - Economics
11
333 - Economics of land & energy
9
363 - Other social problems & services
3
630 - Agriculture & related technologies
3
304 - Factors affecting social behavior
2
336 - Public finance
2
380 - Commerce, communications & transportation
2
610 - Medicine & health
2
370 - Education
1
600 - Technology
1