Classification
170 - Ethics
1
571 - Physiology & related subjects
12
572 - Biochemistry
3
577 - Ecology
2
578 - Natural history of organisms
1
579 - Microorganisms, fungi & algae
2
580 - Plants (Botany)
30
581 - Specific topics in natural history
51
630 - Agriculture & related technologies
4
631 - Techniques, equipment & materials
37
634 - Orchards, fruits & forestry
1
660 - Chemical engineering
40