Classification
330 - Economics
5,627
333 - Economics of land & energy
3,648
320 - Political science
2,689
370 - Education
1,984
363 - Other social problems & services
1,804
304 - Factors affecting social behavior
1,771
610 - Medicine & health
1,771
380 - Commerce, communications & transportation
1,471
600 - Technology
1,393
336 - Public finance
1,049
630 - Agriculture & related technologies
529
340 - Law
5