Classification
363 - Other social problems & services
364 - Criminology
500 - Natural sciences & mathematics
50
331 - Labor economics
16
330 - Economics
14
384 - Communications; telecommunication
6
621 - Applied physics
4
338 - Production
3
658 - General management
3
000 - Computer science, information & general works
2
001 - Knowledge
2
380 - Commerce, communications & transportation
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
300 - Social sciences
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
374 - Adult education
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
600 - Technology
1
720 - Architecture
1
800 - Literature & rhetoric
1
900 - History & geography
1