@proceedings {645, title = {Evidences of Cycles in Tree Ring Records}, year = {1933}, note = {This is available as a physical and electronic copy through the Tree Ring Lab. Please contact the curator for more information. pcreasman@ltrr.arizona.edu}, keywords = {address, cycles, Douglass, evidence, historic, proceedings of the national academy of science, record, tree ring}, author = {Douglass, A.E.} } @article {644, title = {Evidence of Climatic Effects in the Annual Rings}, journal = {Ecology}, volume = {1}, year = {1920}, keywords = {annual rings, climate, climatic, Douglass, Ecology, effect, effects, evidence, historic, rings, tree}, author = {Douglass, A.E.} }