Wallula Gap, Washington state, USA. Twin Sisters: a scab residual of the Missoula Floods on the east bank of the Columbia River in the Wallula Gap. Also known as "Columbia Smoke Stacks" (Horner, 1921, p. 44.)
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Wallula Gap, Washington state, USA. The Sisters: a scab residual of the Missoula Floods on the east bank of the Columbia Rivenr in the Wallula Gap. Photo taken by uploader. All rights released. ~~~~
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