Classification
547 - Organic chemistry
6
668 - Technology of other organic products
5
541 - Physical chemistry
4
546 - Inorganic chemistry
3
551 - Geology, hydrology & meteorology
3
574 - [Unassigned]
3
615 - Pharmacology & therapeutics
3
621 - Applied physics
3
660 - Chemical engineering
3
016 - Bibliographies of works on specific subjects
2
628 - Sanitary & municipal engineering
2
632 - Plant injuries, diseases & pests
2
363 - Other social problems & services
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
616 - Diseases
1
661 - Industrial chemicals
1
664 - Food technology
1
665 - Industrial oils, fats, waxes & gases
1
930 - History of ancient world to ca. 499
1