Classification
500 - Natural sciences & mathematics
620 - Engineering & allied operations
580 - Plants (Botany)
3
600 - Technology
3
630 - Agriculture & related technologies
3
000 - Computer science, information & general works
2
581 - Specific topics in natural history
2
333 - Economics of land & energy
1
551 - Geology, hydrology & meteorology
1
720 - Architecture
1