Classification
336 - Public finance
330 - Economics
8
320 - Political science
7
333 - Economics of land & energy
2
363 - Other social problems & services
2
370 - Education
2
304 - Factors affecting social behavior
1
332 - Financial economics
1
380 - Commerce, communications & transportation
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
900 - History & geography
1