Classification
571 - Physiology & related subjects
126
630 - Agriculture & related technologies
50
580 - Plants (Botany)
33
579 - Microorganisms, fungi & algae
32
581 - Specific topics in natural history
20
592 - Invertebrates
19
660 - Chemical engineering
13
631 - Techniques, equipment & materials
8
572 - Biochemistry
7
570 - Life sciences; biology
6
577 - Ecology
4
333 - Economics of land & energy
3
616 - Diseases
3
634 - Orchards, fruits & forestry
3
363 - Other social problems & services
2
590 - Animals (Zoology)
2
664 - Food technology
2
509 - Historical, geographic & persons treatment
1
547 - Organic chemistry
1
620 - Engineering & allied operations
1