Classification
333 - Economics of land & energy
320 - Political science
948
330 - Economics
607
363 - Other social problems & services
416
304 - Factors affecting social behavior
216
610 - Medicine & health
216
380 - Commerce, communications & transportation
122
600 - Technology
93
630 - Agriculture & related technologies
84
370 - Education
80
336 - Public finance
65
340 - Law
3