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By: Machado, FH - Silva, LF - Dupas, Francisco Antonio - Mattedi, AP - Vergara, FernánType: ArticleIn: Instituto Internacional de EcologiaVolume:Series:Issue:Date: 2014-08-01Page Range:Publication Info: Instituto Internacional de EcologiaSubjects: Brazil Contingent valuation developing country economic valuation of water resources Environmental protection urban watersheds