United States. Army. Corps of Engineers.U.S. Coast and Geodetic Survey.United States, Georgia, Chatham County, 31.97402, -81.09243United States. Army. Corps of Engineers.1920Relief shown by contours and spot heights."Base map and depth curves from U.S.C.& G.S. charts.""Field work by Co.B, 1st Regiment of Engineers, 1912.""Contour interval 10 feet.""Datum is mean sea level.""Datum for depth curves is mean low water."engScale 1:62,500 (W 81°00'-W 80°45′/N 32°-N 31°45′).Washington, D.C. : U.S. Army Corps of Engineers, 1920.http://rightsstatements.org/vocab/NoC-US/1.0/Georgia--Maps, TopographicChatham County (Ga.)--Maps, TopographicGeorgia Wassaw Sound quadrangle Georgia /Ossabaw Island quadrangleOssabaw IslandStillImage