00817cam a22002291 4500 gs 15000679 DLC 20260227111318.0 760409s1915 xx 000 0 eng gs 15000679 (OCoLC)2105101 DLC TxEU DLC premarc QE91 .A4 no.8 Butler, G. M. (Gurdon Montague), 1881- Clays of eastern Colorado, by G. Montague Butler, 1914. Denver, Col., The Smith-Brooks printing company, 1915. 353 p. illus., fold. plans. 24 cm. Colorado Geological Survey. Bulletin, 8 "Partial list of the sources of data consulted in compiling the descriptions of the Colorado clay-bearing formations": p. 148-149. Clay Colorado. 25567 25567