Classification
615 - Pharmacology & therapeutics
8
363 - Other social problems & services
3
600 - Technology
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
628 - Sanitary & municipal engineering
2
330 - Economics
1
333 - Economics of land & energy
1
338 - Production
1
362 - Social welfare problems & services
1
540 - Chemistry & allied sciences
1
542 - Techniques, equipment & materials
1
551 - Geology, hydrology & meteorology
1
577 - Ecology
1
599 - Mammals
1
606 - Organizations
1
630 - Agriculture & related technologies
1
631 - Techniques, equipment & materials
1
632 - Plant injuries, diseases & pests
1
634 - Orchards, fruits & forestry
1
660 - Chemical engineering
1
662 - Explosives, fuels & related products
1