Classification
330 - Economics
2,543
320 - Political science
2,383
333 - Economics of land & energy
2,121
304 - Factors affecting social behavior
1,303
610 - Medicine & health
1,303
363 - Other social problems & services
1,295
370 - Education
1,209
600 - Technology
997
336 - Public finance
974
630 - Agriculture & related technologies
397
380 - Commerce, communications & transportation
393
340 - Law
1