Classification
380 - Commerce, communications & transportation
330 - Economics
186
363 - Other social problems & services
155
333 - Economics of land & energy
122
320 - Political science
114
630 - Agriculture & related technologies
57
600 - Technology
48
336 - Public finance
38
304 - Factors affecting social behavior
33
610 - Medicine & health
33
370 - Education
7
340 - Law
1