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Douglass, AE. 1931. ?Trees And Droughts In Arizona?. Professional Engineer. Professional Engineer.\par \par of Washington, Carneigie Institution. 1929. ?Reports On The Conferences Of Cycles?. Washington, D.C. : Carneige Institution.\par \par Douglass, AE. 1920. ?Evidence Of Climatic Effects In The Annual Rings?. Ecology 1 (No. 1). Ecology.\par \par Douglass, AE. 1914. ?A Method Of Estimating Rainfall By The Growth Of Trees?. Bulletin Of The American Geographic Society XLVI. Bulletin Of The American Geographic Society.\par \par }