Classification
304 - Factors affecting social behavior
275
320 - Political science
503
330 - Economics
544
333 - Economics of land & energy
704
336 - Public finance
187
340 - Law
1
363 - Other social problems & services
569
370 - Education
442
380 - Commerce, communications & transportation
148
600 - Technology
152
610 - Medicine & health
275
630 - Agriculture & related technologies
121