Classification
200 - Religion
320 - Political science
330 - Economics
4
333 - Economics of land & energy
4
581 - Specific topics in natural history
4
600 - Technology
3
304 - Factors affecting social behavior
2
363 - Other social problems & services
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
140 - Specific philosophical schools
1
170 - Ethics
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1