Classification
380 - Commerce, communications & transportation
330 - Economics
74
333 - Economics of land & energy
41
363 - Other social problems & services
40
320 - Political science
28
600 - Technology
22
630 - Agriculture & related technologies
19
304 - Factors affecting social behavior
14
610 - Medicine & health
14
336 - Public finance
10
370 - Education
3
340 - Law
2