Classification
320 - Political science
32
330 - Economics
25
363 - Other social problems & services
20
333 - Economics of land & energy
17
380 - Commerce, communications & transportation
10
304 - Factors affecting social behavior
7
610 - Medicine & health
7
370 - Education
6
336 - Public finance
4
600 - Technology
4
630 - Agriculture & related technologies
2