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General chart of the coast. No. IV, from Cape May to Cape Henry. From a trigonometrical survey under the direction of F. R. Hassler and A. D. Bache, Superintendents of the survey ...
Scale 1:400,000. LC Civil War Maps (2nd ed.), 33.7 From its Report of the Superintendent of the Coast Survey, showing the progress of the survey during the year 1862 (Washington, Government Printing Office., 1864). Map 14. "No. 14" in the upper left corner. "The triangulation was executed by E. Blunt, J. E. Johnstone, J. Farley & J. E. Hilgard, Assistants between 1841 & 1853....
United States Coast Survey