Classification
330 - Economics
266
331 - Labor economics
29
338 - Production
24
658 - General management
18
380 - Commerce, communications & transportation
11
333 - Economics of land & energy
6
302 - Social interaction
5
306 - Culture & institutions
5
340 - Law
5
600 - Technology
5
301 - Sociology & anthropology
3
320 - Political science
3
332 - Financial economics
3
363 - Other social problems & services
3
321 - Systems of governments & states
2
350 - Public administration & military science
2
360 - Social problems & services; associations
2
364 - Criminology
2
388 - Transportation; ground transportation
2
500 - Natural sciences & mathematics
2
610 - Medicine & health
2
910 - Geography & travel
2
100 - Philosophy & psychology
1
171 - Ethical systems
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
303 - Social processes
1
307 - Communities
1
336 - Public finance
1
343 - Military, tax, trade & industrial law
1
351 - Public administration
1
355 - Military science
1
378 - Higher education
1
398 - Folklore
1
570 - Life sciences; biology
1
628 - Sanitary & municipal engineering
1
780 - Music
1