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David Alt

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Stand Alone

Roadside Geology of Idaho (Roadside Geology Series)
Roadside geology of Northern and Central California
Rocks, Ice, and Water - The Geology of Waterton-Glacier Park
Roadside Geology of the Northern Rockies Collecting Site - All Major Roads - National Parks: Craters of the Moon - Glacier - Grand Teton - Yellowstone
Northwest Exposures: A Geologic Story of the Northwest