Desert pavement of concretions on Carlsbad soil, produced from slight erosion. A few miles north of San Diego, Calif.

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Citation

Unknown. 1939. “Desert pavement of concretions on Carlsbad soil, produced from slight erosion. A few miles north of San Diego, Calif..” Special Collections, USDA National Agricultural Library. Accessed August 19, 2022, https://www.nal.usda.gov/exhibits/speccoll/items/show/8286.