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ContributorsHayden, Carl T. (Author) / Smith, George Otih (Author)

Letter from Carl Hayden to George Otis Smith asking his advice regarding the mining of asbestos deposits in the Grand Canyon.

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ContributorsMatthes, F. (Author) / Evans, R. T. (Author) / The Military engineer (Publisher)
DescriptionGeological Survey of the Grand Canyon in published journal. Vol. XVIII, No. 99.