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