Clays of eastern Colorado, by G. Montague Butler, 1914.
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TextPublication details: Denver, Col., The Smith-Brooks printing company, 1915.Description: 353 p. illus., fold. plans. 24 cmSubject(s): LOC classification: - QE91 .A4 no.8
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"Partial list of the sources of data consulted in compiling the descriptions of the Colorado clay-bearing formations": p. 148-149.
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