Classification
304 - Factors affecting social behavior
698
330 - Economics
610 - Medicine & health
320 - Political science
97
333 - Economics of land & energy
82
370 - Education
73
600 - Technology
42
363 - Other social problems & services
36
380 - Commerce, communications & transportation
11
336 - Public finance
10
630 - Agriculture & related technologies
6
340 - Law
2