1909. U.S. Coast and Geodetic Survey. Prepared ... from British and Canadian maps. 44 x 72 centimeters Scale approximately 1:2,553,000 General Map Collection. The Survey (Washington).
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1909. Geological Survey (U.S.). Relief shown by contours and spot heights.; "Control by Coast and Geodetic Survey."; "Surveyed in 1906-1907. Edition of May 1909, reprinted 1921. A... The Survey (Washington).