Determining the total acreage of each soil by use of the planimeter (Scale of Base 1/31,680)

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Citation

Unknown. “Determining the total acreage of each soil by use of the planimeter (Scale of Base 1/31,680).” Special Collections, USDA National Agricultural Library. Accessed August 7, 2022, https://www.nal.usda.gov/exhibits/speccoll/items/show/8235.