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historicalmarkerproject/markers/HM2E31_the-history-of-wallula_Kennewick-WA.html

The History of Wallula. . . Geology at Wallula . From 15,000-18,000 years ago what many geologists believe were the Earth's largest floods raced through Wallula Gap. Some of these floods were as many as twenty times as large as the combined disch…

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