
The Sioux Falls metropolitan area serves as the primary anchor for this 1955 survey, which covers a massive cross-section of the eastern South Dakota plains and the neighboring corners of Minnesota and Iowa. This era captures the region's dense agricultural grid before the consolidation of family farms, with small towns like Salem, Canton, and Madison functioning as vital railroad hubs. The landscape is defined by the glacial legacy of the Prairie Coteau, evidenced by the cluster of water bodies in the north including Lake Madison, Lake Herman, and Brant Lake.
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