Classification
330 - Economics
4
363 - Other social problems & services
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
320 - Political science
2
333 - Economics of land & energy
2
576 - Genetics & evolution
2
610 - Medicine & health
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
600 - Technology
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
900 - History & geography
1