Classification
320 - Political science
38
333 - Economics of land & energy
38
630 - Agriculture & related technologies
363 - Other social problems & services
21
330 - Economics
13
380 - Commerce, communications & transportation
6
304 - Factors affecting social behavior
5
610 - Medicine & health
5
600 - Technology
4
370 - Education
2
336 - Public finance
1