Classification
320 - Political science
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
333 - Economics of land & energy
6
700 - The arts; fine & decorative arts
6
000 - Computer science, information & general works
5
551 - Geology, hydrology & meteorology
4
300 - Social sciences
3
600 - Technology
3
900 - History & geography
3
140 - Specific philosophical schools
2
370 - Education
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
720 - Architecture
2
100 - Philosophy & psychology
1
170 - Ethics
1
200 - Religion
1
304 - Factors affecting social behavior
1
550 - Earth sciences
1
610 - Medicine & health
1
650 - Management & auxiliary services
1
657 - Accounting
1
658 - General management
1
800 - Literature & rhetoric
1