Classification
000 - Computer science, information & general works
140 - Specific philosophical schools
320 - Political science
330 - Economics
3
551 - Geology, hydrology & meteorology
610 - Medicine & health
700 - The arts; fine & decorative arts
3
363 - Other social problems & services
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
333 - Economics of land & energy
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
800 - Literature & rhetoric
1