1. Missouri-Illinois-Kentucky, Wickliffe quadrangle : grid zone 'C' Maps University Of Illinois Urbana Champaign Public content 1941. Geological Survey (U.S.). Contour interval 5 feet.;"Topography by Corps of Engineers...1930-39. Revised by Mississippi River Commission, 1932, 1935 and 1939.";Relief shown b... Army Map Service (U.S.).