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