Office of the State Archaeology, Iowa City, IA No description specified. 1-1 (1 Record) Documents Technical Proposal - Data Recovery at a Great Oasis Hamlet: Phase III Archaeological Mitigation at the Cowan Site (13Wd88), NHS-75-1(54)--19-97, A.K.A. PIN 91-97060-1, Woodbury County, Iowa (1992)