Classification
330 - Economics
319
333 - Economics of land & energy
236
320 - Political science
133
370 - Education
133
304 - Factors affecting social behavior
111
610 - Medicine & health
111
600 - Technology
79
363 - Other social problems & services
61
380 - Commerce, communications & transportation
56
630 - Agriculture & related technologies
40
336 - Public finance
35
340 - Law
2