Weakly, Ward Fredrick. 1968. ?Tree-Ring Dating And Archaeology In South Dakota?. Anthropology. Anthropology. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=757411981&sid=5&Fmt=1&clientId=43922&RQT=309&VName=PQD.