United States. Geological Survey. Relief shown by 20 ft. contour interval. "Henry Gannet, Chief Geographer, H.M. Wilson, Geographer in charge; Topography by Frank Sutton and J.H. Jennings; surveyed in 1891-1892. Triangulation by N. Y. State Survey and by U.S. Coast and Geodetic Survey." "Surveyed in 1891-2 in cooperation wthe State of New York.".