@book {620, title = {Tree-Ring Dates from New Mexico I,O,U Central Rio Grande Area}, year = {1972}, publisher = {University of Arizona}, organization = {University of Arizona}, address = {Tucson}, keywords = {Archaeology, date, dendrochronology, new mexico, rio grande area, tree rings}, author = {Robinson, William J. and Hannah, John W. and Harrill, Bruce G.} }