Classification
363 - Other social problems & services
333 - Economics of land & energy
548
330 - Economics
514
320 - Political science
353
380 - Commerce, communications & transportation
210
630 - Agriculture & related technologies
192
304 - Factors affecting social behavior
136
610 - Medicine & health
136
600 - Technology
96
336 - Public finance
72
370 - Education
35