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1. Illinois, Harrisburg quadrangle Illinois, Harrisburg quadrangle Illinois; Maps; Topographic maps; Topography; Harrisburg (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1921 and 1923."; "Contour interval 20 feet."

2. Illinois, Havana quadrangle Illinois, Havana quadrangle Illinois; Maps; Topographic maps; Topography; Havana (Ill.) Relief shown by contours and spot heights.; "Control in part by Illinois River Commission and Corps of Engineers U.S. Army."; "Surveyed in 1922-1923."; "Contour interval 20 feet." Coordinates: (W 90⁰15ʹ00ʺ--W...
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