Classification
330 - Economics
348
333 - Economics of land & energy
276
304 - Factors affecting social behavior
170
610 - Medicine & health
170
320 - Political science
138
600 - Technology
113
363 - Other social problems & services
111
380 - Commerce, communications & transportation
66
630 - Agriculture & related technologies
42
370 - Education
40
336 - Public finance
23
340 - Law
2