Classification
330 - Economics
182
320 - Political science
63
333 - Economics of land & energy
38
600 - Technology
34
363 - Other social problems & services
32
380 - Commerce, communications & transportation
22
304 - Factors affecting social behavior
13
610 - Medicine & health
13
336 - Public finance
10
630 - Agriculture & related technologies
8
370 - Education
3