Classification
610 - Medicine & health
630 - Agriculture & related technologies
000 - Computer science, information & general works
4
580 - Plants (Botany)
4
600 - Technology
4
620 - Engineering & allied operations
4
333 - Economics of land & energy
2
330 - Economics
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
581 - Specific topics in natural history
1