Classification
304 - Factors affecting social behavior
6
320 - Political science
53
330 - Economics
20
333 - Economics of land & energy
53
336 - Public finance
1
363 - Other social problems & services
30
370 - Education
2
380 - Commerce, communications & transportation
8
600 - Technology
5
610 - Medicine & health
6
630 - Agriculture & related technologies