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David training local construction workers how to make a Horizontal Sub-Surface Flow Constructed Wetland for wastewater treatment, at the Catholic aviation program in Wamena, Papua, May 2013. [Papua Wamena 2013-05 042 Indonesia]
PapuaWamena2013042IndonesiaAsiaDavidDevelopmentEnvironmentFamilyNew GuineaPeopleSanitationSustainability
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