Classification
380 - Commerce, communications & transportation
330 - Economics
189
363 - Other social problems & services
155
333 - Economics of land & energy
123
320 - Political science
115
630 - Agriculture & related technologies
57
600 - Technology
48
336 - Public finance
38
304 - Factors affecting social behavior
34
610 - Medicine & health
34
370 - Education
7
340 - Law
1