Classification
200 - Religion
320 - Political science
600 - Technology
304 - Factors affecting social behavior
2
330 - Economics
2
551 - Geology, hydrology & meteorology
2
300 - Social sciences
1
333 - Economics of land & energy
1
380 - Commerce, communications & transportation
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1