Classification
320 - Political science
189
330 - Economics
166
333 - Economics of land & energy
106
304 - Factors affecting social behavior
90
610 - Medicine & health
90
370 - Education
86
600 - Technology
53
363 - Other social problems & services
36
336 - Public finance
34
380 - Commerce, communications & transportation
22
630 - Agriculture & related technologies
11