Classification
630 - Agriculture & related technologies
53
577 - Ecology
33
363 - Other social problems & services
6
660 - Chemical engineering
5
610 - Medicine & health
4
628 - Sanitary & municipal engineering
4
571 - Physiology & related subjects
3
551 - Geology, hydrology & meteorology
2
570 - Life sciences; biology
2
615 - Pharmacology & therapeutics
2
620 - Engineering & allied operations
2
540 - Chemistry & allied sciences
1
547 - Organic chemistry
1
572 - Biochemistry
1
616 - Diseases
1
631 - Techniques, equipment & materials
1