@article {790, title = {Tree Rings and Climatic Cycles, Laboratory of Tree-Ring Research, Astronomical Studies}, volume = {XXIV}, year = {1944}, publisher = {University of Arizona}, address = {Tucson}, keywords = {astronomy, climate, dating, dendrochronology, Douglass, environment, fraternity, historic, tree ring, tree ring laboratory}, author = {Peterson, Roy M. and Douglass, A.E.} }