Classification
547 - Organic chemistry
48
660 - Chemical engineering
45
628 - Sanitary & municipal engineering
40
615 - Pharmacology & therapeutics
37
541 - Physical chemistry
32
620 - Engineering & allied operations
28
664 - Food technology
28
668 - Technology of other organic products
28
621 - Applied physics
20
543 - Analytical chemistry
18
546 - Inorganic chemistry
14
572 - Biochemistry
14
616 - Diseases
13
632 - Plant injuries, diseases & pests
12
363 - Other social problems & services
11
661 - Industrial chemicals
11
574 - [Unassigned]
10
612 - Human physiology
8
631 - Techniques, equipment & materials
7
540 - Chemistry & allied sciences
6
610 - Medicine & health
6
542 - Techniques, equipment & materials
5
662 - Explosives, fuels & related products
5
553 - Economic geology
4
581 - Specific topics in natural history
4
613 - Personal health & safety
4
665 - Industrial oils, fats, waxes & gases
4
681 - Precision instruments & other devices
4
930 - History of ancient world to ca. 499
4
338 - Production
3
507 - Education, research & related topics
3
663 - Beverage technology
3
667 - Cleaning, color & coating technologies
3
676 - Pulp & paper technology
3
530 - Physics
2
548 - Crystallography
2
549 - Mineralogy
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
577 - Ecology
2
623 - Military & nautical engineering
2
635 - Garden crops (Horticulture)
2
677 - Textiles
2
174 - Occupational ethics
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
334 - Cooperatives
1
344 - Labor, social, education & cultural law
1
523 - Specific celestial bodies & phenomena
1
535 - Light & infrared & ultraviolet phenomena
1
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