United States. Geological Survey. U.S.G.S. Alternate title: Harlem, N.Y.-N.J. Polyconic projection. Relief shown by 20 feet contour interval. Surveyed in 1888-89 and 1897 in cooperation with the State of New York. Partial revision of shore line in 1924. Triangulation by the U.S. Coast and Geodetic Survey. Verso: The topographic maps of the United States.