United States. Geological Survey. U.S.G.S. Alternate title: Berlin, N.Y.-MASS.-VT. Polyconic projection. Relief shown by 20 feet contour interval. Surveyed in cooperation with the States of Massachusstts and New York. 1885-88. Triangulation by the U.S. Coast and Geodetic Survey. Verso: The topographic maps of the United States.