Classification
333 - Economics of land & energy
320 - Political science
186
330 - Economics
125
363 - Other social problems & services
85
304 - Factors affecting social behavior
62
610 - Medicine & health
62
380 - Commerce, communications & transportation
40
630 - Agriculture & related technologies
30
336 - Public finance
14
600 - Technology
14
370 - Education
10
340 - Law
1