Classification
600 - Technology
7
620 - Engineering & allied operations
630 - Agriculture & related technologies
000 - Computer science, information & general works
5
580 - Plants (Botany)
3
333 - Economics of land & energy
2
363 - Other social problems & services
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
900 - History & geography
2
330 - Economics
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
612 - Human physiology
1