Classification
140 - Specific philosophical schools
320 - Political science
330 - Economics
600 - Technology
333 - Economics of land & energy
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
551 - Geology, hydrology & meteorology
2
200 - Religion
1
304 - Factors affecting social behavior
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
900 - History & geography
1