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  1. Cataclysms on the Columbia : a layman's guide to the features produced by the catastrophic Bretz floods in the Pacific Northwest /
    Cataclysms on the Columbia
    a layman's guide to the features produced by the catastrophic Bretz floods in the Pacific Northwest
    Book
    by Allen, John Eliot, 1908-1996
    Published 1986
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  2. The magnificent gateway : a layman's guide to the geology of the Columbia River Gorge /
    The magnificent gateway
    a layman's guide to the geology of the Columbia River Gorge
    Book
    by Allen, John Eliot, 1908-1996
    Published 1979
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  3. Geologic history of the Columbia River Gorge, as interpreted from the historic Columbia River scenic highway /
    by Williams, Ira A.
    Published 1991
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