Classification
547 - Organic chemistry
139
660 - Chemical engineering
102
615 - Pharmacology & therapeutics
93
541 - Physical chemistry
90
628 - Sanitary & municipal engineering
90
540 - Chemistry & allied sciences
83
668 - Technology of other organic products
83
664 - Food technology
73
620 - Engineering & allied operations
69
543 - Analytical chemistry
47
621 - Applied physics
46
632 - Plant injuries, diseases & pests
41
363 - Other social problems & services
38
546 - Inorganic chemistry
31
616 - Diseases
31
572 - Biochemistry
30
612 - Human physiology
28
574 - [Unassigned]
24
662 - Explosives, fuels & related products
23
661 - Industrial chemicals
22
542 - Techniques, equipment & materials
17
665 - Industrial oils, fats, waxes & gases
16
610 - Medicine & health
15
667 - Cleaning, color & coating technologies
12
338 - Production
11
631 - Techniques, equipment & materials
11
551 - Geology, hydrology & meteorology
10
581 - Specific topics in natural history
9
663 - Beverage technology
9
613 - Personal health & safety
8
333 - Economics of land & energy
7
577 - Ecology
7
676 - Pulp & paper technology
7
681 - Precision instruments & other devices
7
507 - Education, research & related topics
6
553 - Economic geology
6
530 - Physics
5
539 - Modern physics
5
571 - Physiology & related subjects
5
614 - Incidence & prevention of disease
5
674 - Lumber processing, wood products & cork
5
677 - Textiles
5
930 - History of ancient world to ca. 499
5
346 - Private law
4
548 - Crystallography
4
635 - Garden crops (Horticulture)
4
641 - Food & drink
4
306 - Culture & institutions
3
537 - Electricity & electronics
3
549 - Mineralogy
3
more ...