Classification
304 - Factors affecting social behavior
2,517
320 - Political science
303
330 - Economics
955
333 - Economics of land & energy
322
336 - Public finance
30
340 - Law
3
363 - Other social problems & services
137
370 - Education
217
380 - Commerce, communications & transportation
54
600 - Technology
131
610 - Medicine & health
630 - Agriculture & related technologies
33