BOOKS by Robert Sumner Sigafoos

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1	The river and the rocks : the geologic story of Great Falls and Potomac River Gorge more books like this by John Calvin Reed, Robert Sumner Sigafoos, George Wescott Fisher add to wishlist see all copies from $5.00!
2	Recent activity of glaciers of Mount Rainier, Washington more books like this by Robert Sumner Sigafoos, Ernest LeRoy Hendricks $50.00 (used hardcover, see detail)* add to wishlist see all copies from $50.00!
3	Botanical evidence of floods and flood-plain deposition more books like this by Robert Sumner Sigafoos add to wishlist see all copies from $21.25! first editions
4	Botanical evidence of the modern history of Nisqually Glacier, Washington more books like this by Robert Sumner Sigafoos, Ernest LeRoy Hendricks $11.00 (used softcover, see detail)* add to wishlist see all copies from $11.00!

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