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