Classification
320 - Political science
142
333 - Economics of land & energy
142
330 - Economics
47
304 - Factors affecting social behavior
24
610 - Medicine & health
24
363 - Other social problems & services
23
380 - Commerce, communications & transportation
12
630 - Agriculture & related technologies
9
370 - Education
5
600 - Technology
2
336 - Public finance
1