Classification
540 - Chemistry & allied sciences
13
660 - Chemical engineering
3
306 - Culture & institutions
2
363 - Other social problems & services
2
541 - Physical chemistry
2
542 - Techniques, equipment & materials
2
547 - Organic chemistry
2
620 - Engineering & allied operations
2
664 - Food technology
2
668 - Technology of other organic products
2
174 - Occupational ethics
1
346 - Private law
1
371 - Schools & their activities; special education
1
538 - Magnetism
1
546 - Inorganic chemistry
1
615 - Pharmacology & therapeutics
1
616 - Diseases
1
632 - Plant injuries, diseases & pests
1
663 - Beverage technology
1
669 - Metallurgy
1
681 - Precision instruments & other devices
1