Classification
330 - Economics
5,706
333 - Economics of land & energy
3,679
320 - Political science
2,746
370 - Education
2,020
363 - Other social problems & services
1,829
304 - Factors affecting social behavior
1,797
610 - Medicine & health
1,797
380 - Commerce, communications & transportation
1,491
600 - Technology
1,410
336 - Public finance
1,061
630 - Agriculture & related technologies
533
340 - Law
5