01976oam 2200565 450 991070423110332120160311172523.0(CKB)5470000002439366(OCoLC)885009231(EXLCZ)99547000000243936620140731d1953 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierRefractory clay deposits of south-central Colorado a description of the refractory and semirefractory clays in the Purgatoire formation and Dakota sandstone /by Karl M. Waagé[Washington, D.C.] :United States Department of the Interior, Geological Survey,1953.Washington :United States Government Printing Office.1 online resource (vi, 104 pages, 5 pages of plates) illustrationsGeological Survey bulletin ;993Title from title screen (viewed July 21, 2014).Includes bibliographical references and index.Refractory clay deposits of south-central Colorado ClayColoradoGeology, StratigraphicCretaceousGeologyColoradoClayfastCretaceous Geologic PeriodfastGeologyfastGeology, StratigraphicfastColoradofastClayGeology, StratigraphicGeologyClay.Cretaceous Geologic Period.Geology.Geology, Stratigraphic.Waagé Karl M(Karl Mensch),1915-1999,1404625Geological Survey (U.S.),COPCOPOCLCOOCLCFGPOBOOK9910704231103321Refractory clay deposits of south-central Colorado3538903UNINA