1. Illinois (Macoupin County), Carlinville quadrangle Maps University Of Illinois Urbana Champaign Public content 1925. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1923.";Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).