1911. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1909.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
Search Results
1911. United States. Mississippi River Commission. 63 maps;360,000." "Contour lines are five feet apart.";56 x 92 cm.;1:20,000. Mississippi River Commission (St. Louis, Mo.).