http://dewey.info/scheme/edition/e23/ en
661 Technology of industrial chemicals
661.8 Organic chemicals
661.802 Cellulose derivatives 661.803 Coal tar chemicals 661.804 Petrochemicals 661.805 Synthetic chemicals 661.806 Essential oils 661.807 Solvents, diluents, extenders 661.808 Photographic chemicals and photosensitive surfaces 661.81 Hydrocarbons 661.82 Alcohols and phenols 661.83 Esters 661.84 Ethers 661.85 Aldehydes and ketones 661.86 Acids 661.87 Phosphorus compounds 661.88 Silicon compounds 661.89 Other organic compounds
http://dewey.info/scheme/edition/e22/ de
661 Industriechemikalien
661.8 Organische Chemikalien
661.802 Zellulosederivate 661.803 Chemikalien aus Steinkohlenteer 661.804 Petrochemikalien 661.805 Synthetische Chemikalien 661.806 Etherische Öle 661.807 Lösungs-, Verdünnungs-, Streckmittel 661.808 Photochemikalien und fotosensitive Oberflächen 661.81 Kohlenwasserstoffe 661.82 Alkohole und Phenole 661.83 Ester 661.84 Ether 661.85 Aldehyde und Ketone 661.86 Säuren 661.87 Phosphorverbindungen 661.88 Siliziumverbindungen 661.89 Andere organische Verbindungen
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