Classification
330 - Economics
7,174
333 - Economics of land & energy
5,072
320 - Political science
3,956
370 - Education
3,094
363 - Other social problems & services
2,584
304 - Factors affecting social behavior
2,517
610 - Medicine & health
2,517
380 - Commerce, communications & transportation
2,063
600 - Technology
1,761
336 - Public finance
1,403
630 - Agriculture & related technologies
811
340 - Law
7