Norris, Stanley E. Geology and hydrology of the Piqua area, Ohio / by Stanley E. Norris and Andrew M. Spieker. -- Washington : United States Government Printing Office, 1961 - 33 p. -- (Geological Survey Bulletin ; 1133-A). Subjects--Topical Terms: GeologíaOhio Universal Decimal Class. No.: 55(771)