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