1877. Mitchell, S. Augustus (Samuel Augustus), 1792-1868, cartographer. Prime meridian: Washington.; Detached from an atlas, no. 68. Scale approximately 1:1,300,000. S. Augustus Mitchell.
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1860. Mitchell, S. Augustus (Samuel Augustus), 1792-1868. Prime meridians: Greenwich, Washington. Imprint from copyright statement. Scale approximately 1:2,281,000. Approximately 1 inch to 38 miles. S. Augustus Mitchell.