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