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  1. The clays of the state of Washington, their geology, mineralogy, and technology.
    by Shedd, Solon, 1860-1941
    Published 1910
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  2. Nontronite in the Columbia river region,
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  3. Market for Columbia River hydroelectric power using Northwest minerals.
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  4. Clay deposits of Spokane County, Washington,
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  5. Clays and shales of Washington,
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  6. The composition and origin of certain commercial clays of northern Idaho /
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