1. Refractory clay deposits of south-central Colorado Author/Creator: Waagé, Karl M. 1915-1999. (Karl Mensch) Publication/Creation: Washington [D.C.] : U.S. G.P.O., 1953 Resource Type: Book Is Part Of: U.S. Geological Survey bulletin, no. 992-994. Access & Availability: Loading
2. Refractory clay deposits of south-central Colorado : a description of the refractory and semirefractory clays in the Purgatoire formation and Dakota sandstone Author/Creator: Waagé, Karl M. 1915-1999, (Karl Mensch), author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1953 Resource Type: Book Access & Availability: Loading