Classification
547 - Organic chemistry
39
541 - Physical chemistry
33
546 - Inorganic chemistry
17
668 - Technology of other organic products
17
574 - [Unassigned]
15
660 - Chemical engineering
11
665 - Industrial oils, fats, waxes & gases
11
621 - Applied physics
10
628 - Sanitary & municipal engineering
10
661 - Industrial chemicals
9
662 - Explosives, fuels & related products
8
551 - Geology, hydrology & meteorology
6
615 - Pharmacology & therapeutics
6
540 - Chemistry & allied sciences
5
543 - Analytical chemistry
5
632 - Plant injuries, diseases & pests
5
930 - History of ancient world to ca. 499
5
664 - Food technology
4
548 - Crystallography
3
572 - Biochemistry
3
620 - Engineering & allied operations
3
667 - Cleaning, color & coating technologies
3
016 - Bibliographies of works on specific subjects
2
025 - Library operations
2
363 - Other social problems & services
2
530 - Physics
2
581 - Specific topics in natural history
2
610 - Medicine & health
2
338 - Production
1
344 - Labor, social, education & cultural law
1
358 - Air & other specialized forces
1
537 - Electricity & electronics
1
553 - Economic geology
1
591 - Specific topics in natural history
1
613 - Personal health & safety
1
616 - Diseases
1
617 - Surgery & related medical specialties
1
622 - Mining & related operations
1
629 - Other branches of engineering
1
631 - Techniques, equipment & materials
1
641 - Food & drink
1
658 - General management
1
663 - Beverage technology
1
674 - Lumber processing, wood products & cork
1
677 - Textiles
1