WWater management researchWater management researchde W. R. Derrick SewellMateriasCanadaPollutionWaterWater conservationWater resources developmentEdiciones (1)Water management research (1969)Policy and Planning Branch, Dept. of Energy, Mines and Resources · inglésMás obras de W. R. Derrick SewellNatural resources for a democratic societyProject appraisal and policy reviewPublic participation in planning