United States. Geological Survey. U.S.G.S. Alternate title: Stonington, Conn.-R.I.-N.Y. Polyconic projection. Relief shown by 20 feet contour interval and spot heights. Surveyed in 1888. Surveyed in cooperation with the States of Connecticut and Rhode Island. Triangulation and coast line by U.S. Coast and Geodetic Survey. Verso: The topographic maps of the United States.