Classification
330 - Economics
320 - Political science
4
600 - Technology
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
300 - Social sciences
2
551 - Geology, hydrology & meteorology
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
160 - Logic
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
658 - General management
1
900 - History & geography
1