United States. Geological Survey. U.S.G.S. Alternate title: Pittsfield, Mass.-N.Y. Polyconic projection. Relief shown by 20 feet contour interval and spot heights. Surveyed in 1885-8 in cooperation with the states of Mass. and N.Y. Triangulation by the U.S. Coast and Geodetic Survey and C. C. Bassett. Verso: The topographic maps of the United States.