1750. Mitchell, John, 1711-1768. Scale [ca. 1:4,000,000]. Not 69 1/2 English miles to a degree; 1 map; 66 x 96 cm. North America--Maps--Early works to 1800. U.S. Geological Survey.
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1973. Geological Survey (U.S.). Relief shown by contours and spot heights.; Compiled in 1970.; Includes population key.; Source data U.S Dept. of the interior - Geological Survey ... U.S. Geological Survey.
1950. Printed 1950--Margin. Scale 1:500,000; Lambert conformal conic projection. U.S. Geological Survey.
1963. Relief shown by contours and spot heights. Depths by contours and soundings.; Contour interval 5 and 10 feet.; Red tint indicates areas in which on... U.S. Geological Survey.