Classification
577 - Ecology
12
620 - Engineering & allied operations
8
631 - Techniques, equipment & materials
5
660 - Chemical engineering
5
630 - Agriculture & related technologies
3
363 - Other social problems & services
2
540 - Chemistry & allied sciences
2
572 - Biochemistry
2
579 - Microorganisms, fungi & algae
2
628 - Sanitary & municipal engineering
2
333 - Economics of land & energy
1
615 - Pharmacology & therapeutics
1
641 - Food & drink
1
664 - Food technology
1