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solid or viscous mixtures of naturally occurring hydrocarbons with inert mineral matter, bituumen - mustjaspruun või must termoplastne vedel kuni tahke amorfne aine, süsivesinike, hapniku-, väävli- ja lämmastikuühendite keerukas segu
looduslik bituumen . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/looduslik%20bituumen/1/est (03.07.2026)
