Classification
660 - Chemical engineering
6
661 - Industrial chemicals
3
541 - Physical chemistry
2
553 - Economic geology
2
662 - Explosives, fuels & related products
2
665 - Industrial oils, fats, waxes & gases
2
546 - Inorganic chemistry
1
621 - Applied physics
1
622 - Mining & related operations
1
628 - Sanitary & municipal engineering
1
629 - Other branches of engineering
1
666 - Ceramic & allied technologies
1