Classification
200 - Religion
581 - Specific topics in natural history
10
320 - Political science
4
330 - Economics
4
333 - Economics of land & energy
4
363 - Other social problems & services
3
600 - Technology
3
304 - Factors affecting social behavior
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
700 - The arts; fine & decorative arts
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
170 - Ethics
1
500 - Natural sciences & mathematics
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1