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