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Album caption and index card: Oblique aerial view of the confluence of Columbia and Cowlitz Rivers showing suspended sediment and debris in the Cowlitz River caused by the eruption of Mount St. Helens on May 18, 1980. City of Longview in background. Cowlitz County, Washington. May 23, 1980. Published as figure 12 in U.S. Geological Survey. Circular 850-K. 1983.


    map background search result map search result map Oblique aerial view of the confluence of the Columbia and Cowlitz Rivers. Cowlitz County, Washington. 1980. Oblique aerial view of the confluence of the Columbia and Cowlitz Rivers. Cowlitz County, Washington. 1980.