Description: A map showing the canyon of the Snake River at the Seven Devils. Sketch contours, interval approximately 500 feet. The cross-lined areas represent basalt-covered surface; the blank areas represent older slates, schists, etc. Source: Isaiah Bowman, Ph. D., Forest Physiography (New York, NY: John Wiley and Sons, 1911) 195 Map Credit: The Private Collection of Roy Winkelman. |
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