Classification
330 - Economics
1,812
304 - Factors affecting social behavior
54
610 - Medicine & health
54
370 - Education
45
336 - Public finance
35
363 - Other social problems & services
34
333 - Economics of land & energy
21
320 - Political science
19
380 - Commerce, communications & transportation
12
600 - Technology
7
630 - Agriculture & related technologies
5