http://dewey.info/scheme/edition/e23/ en
620.19 Other engineering materials
620.192 Polymers
620.1920287 Testing and measurement 620.19204 Special topics of polymers 620.1923 Plastics 620.1924 Gums and resins
http://dewey.info/scheme/edition/e22/ de
620.19 Andere Werkstoffe
620.192 Polymere
620.1920287 Testen und Messen 620.19204 Spezielle Themen zu Polymeren 620.1923 Kunststoffe 620.1924 Gummis und Harze
Dewey Decimal Classification
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