Classification
333 - Economics of land & energy
320 - Political science
191
330 - Economics
126
363 - Other social problems & services
87
304 - Factors affecting social behavior
64
610 - Medicine & health
64
380 - Commerce, communications & transportation
40
630 - Agriculture & related technologies
30
600 - Technology
15
336 - Public finance
14
370 - Education
11
340 - Law
1