Classification
304 - Factors affecting social behavior
333 - Economics of land & energy
610 - Medicine & health
8
630 - Agriculture & related technologies
320 - Political science
6
363 - Other social problems & services
5
330 - Economics
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
370 - Education
1
581 - Specific topics in natural history
1
600 - Technology
1
700 - The arts; fine & decorative arts
1