@book {623,
	title = {Tree-Ring Dates from Colorado V Mesa Verde Area},
	year = {1974},
	publisher = {University of Arizona},
	organization = {University of Arizona},
	address = {Tucson},
	keywords = {colorado, date, dendrochronology, mesa verde, southwest, tree ring},
	author = {Robinson, William J. and Harrill, Bruce G.}
}
