Classification
320 - Political science
91
333 - Economics of land & energy
89
330 - Economics
66
370 - Education
39
304 - Factors affecting social behavior
36
610 - Medicine & health
36
363 - Other social problems & services
35
336 - Public finance
33
600 - Technology
20
630 - Agriculture & related technologies
18
380 - Commerce, communications & transportation
7