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Ash-flow tuffs
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Halloysite and allophane
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Minerals of the Montmorillonite group
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Occurrence and origin of the titanium deposits of Nelson and Amherst counties, Virginia
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Origin of the copper deposits of the Ducktown type in the southern Appalachian region
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The kaolin minerals
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Water-laid volcanic rocks of early upper cretaceous age in southwestern Arkansas, southeastern Oklahoma and northeastern Texas
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