Classification
336 - Public finance
330 - Economics
218
320 - Political science
93
333 - Economics of land & energy
83
363 - Other social problems & services
72
380 - Commerce, communications & transportation
59
304 - Factors affecting social behavior
30
610 - Medicine & health
30
600 - Technology
20
370 - Education
9
630 - Agriculture & related technologies
7