NY, Harper & Row, (1975). Winner of the 1976 John Burroughs Medal for distinguished writing in the field of natural history. In this book, Zwinger explores the 730 miles of the Green River from its source in Wyoming's Wind River range to its confluence with the Colorado River in Utah's Canyon Lands National Park. This copy is inscribed by Zwinger "to the Richards." A fine copy in a very near fine, price-clipped dust jacket with two tiny edge tears at the lower edge of the rear panel. John Burroughs Medal label attached to the front panel. Illustrated with maps and drawings by the author. [#035035] SOLD