No. 30. Conn.-R.I.-N.Y. Stonington sheet. U.S. Geological Survey, J.W. Powell, Director. State of Connecticut ... State of Rhode Island ... commissioners. Henry Gannett, Chief Geographer. Marcus Baker, Geographer in charge. Triangulation by the U.S. Coast and Geodetic Survey. E.B. Clark and F.P. Gulliver. Surveyed in 1888. (1893)