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2. Soil productivity on different landscape positions in the Columbia Plateau of Oregon and Washington;Douglas,1984
3. Guidelines for predicting crop water requirements;F.A.O.;Irrigation and Drainage Paper 24,1977
4. Yield response to water;F.A.O.;Irrigation and Drainage Paper 33,1979
5. A method for the practical application of the Penman formula for the estimation of potential evapotranspiration and evaporation from a free water surface;Frere;FAO, AGP: Ecol./1979/1,1979