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  1. Published 1987
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  2. by Alt, David D.
    Published 1989
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  3. 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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  4. by Alt, David D.
    Published 1986
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  5. by Ekman, Leonard C.
    Published 1962
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  6. by Alt, David D.
    Published 1978
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  7. Rocks ice & water;
    the geology of Waterton-Glacier Park
    Book
    by Alt, David D.
    Published 1973
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  8. The Smithsonian guides to natural America
    The Pacific Northwest--Washington and Oregon
    Book
    by Chasan, Daniel Jack
    Published 1995
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  9. Field guide to old-growth forests
    exploring ancient forest ecosystems from California to the Pacific Northwest
    Book
    by Eifert, Larry
    Published 2000
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  10. by Alt, David D.
    Published 1972
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  11. Fire faults & floods
    a road and trail guide exploring the origins of the Columbia River Basin
    Book
    by Mueller, Marge
    Published 1997
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  12. Bogs meadows marshes & swamps
    a guide to 25 wetland sites of Washington State
    Book
    by Churney, Marie
    Published 1996
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  13. Published 1989
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  14. Lewis and Clark's mountain wilds
    a site guide to the plants and animals they encountered in the Bitterroots
    Book
    by Ritter, Sharon A.
    Published 2002
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  15. Geological excursions in the Pacific Northwest
    Geological Society of America 1977 annual meeting Seattle
    Book
    Published 1977
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  16. by MacRae, Diann
    Published 1995
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  17. by Satterfield, Archie
    Published 1996
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  18. by Amara, Mark S.
    Published 1996
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  19. by Perry, John, 1914-2009
    Published 1988
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