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Image: Wallula-Gap-the-sisters

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Description: 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.)
Title: Wallula-Gap-the-sisters
Credit: Own work
Author: Williamborg 05:37, 1 October 2006 (UTC)
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes

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