2014. National Atlas of the United States. This line shapefile includes Global Map data showing the canals, aqueducts, and the Intracoastal Waterway in the United States, Puerto Rico, and th... National Atlas of the United States.
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1916. Sherman, C. E. (Christopher Elias), 1869-1940. Scale approximately1:31 680. "March 20, 1916." "Map no. 1." Includes legend. report of C.E. Sherman.