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
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