United States. Geological Survey. North Decimal Degree 43.7500. South Decimal Degree 43.500. East Decimal Degree -70.0000. West Decimal Degree -70.5000. Alternate title: Portland and vicinity. Relief shown by 20 ft. contour lines and spot elevation. Depths by bathymetric isolines. "R. B. Marshall, Chief Geographer. Topography by Hersey Munroe, J.H. Wheat, R.C. Seitz, R.A. Kiger, and K.F. Maxcy. Soundings by U.S. Coast and Geodetic Survey."; surveyed in 1914. Verso: The topographic maps of the United States / by The Director, United States Geological Survey, Washington, D.C., June, 1916.
