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  1. by Alt, David D.
    Published 1972
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  2. Northwest exposures
    a geologic study of the Northwest
    Book
    by Alt, David D.
    Published 1995
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  3. by Alt, David D.
    Published 1989
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  4. by Alt, David D.
    Published 1978
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  5. by Alt, David D.
    Published 1984
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  6. Profiles of Montana geology
    a layman's guide to the Treasure State
    Book
    by Alt, David D.
    Published 1984
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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. by Alt, David D.
    Published 1986
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