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ContributorsMaxon, John H. (Author) / Campbell, Ian (Author) / American Journal of Science (Publisher)
DescriptionExcerpt on the Archean Ripple Mark 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.