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Seed bed on Palouse silty clay loam east of Walla Walla, Washington.
Unknown. 1936. “Seed bed on Palouse silty clay loam east of Walla Walla, Washington..” Special Collections, USDA National Agricultural Library. Accessed August 19, 2022, https://www.nal.usda.gov/exhibits/speccoll/items/show/8278.