Classification
000 - Computer science, information & general works
363 - Other social problems & services
581 - Specific topics in natural history
610 - Medicine & health
630 - Agriculture & related technologies
330 - Economics
5
700 - The arts; fine & decorative arts
5
320 - Political science
4
333 - Economics of land & energy
4
551 - Geology, hydrology & meteorology
3
580 - Plants (Botany)
3
600 - Technology
3
620 - Engineering & allied operations
3
140 - Specific philosophical schools
2
100 - Philosophy & psychology
1
304 - Factors affecting social behavior
1
540 - Chemistry & allied sciences
1