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Illinois Maps Topograp... (1)
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1. Illinois, Carbondale quadrangle : topography Illinois, Carbondale quadrangle : topography Illinois; Maps; Topographic maps; Topography; Carbondale (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1919 and 1921."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

2. Illinois, Vermont quadrangle : topography Illinois, Vermont quadrangle : topography Maps; Topographic maps; Topography; Illinois; Vermont (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1916 and 1919."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

3. Illinois, Vienna quadrangle : topography Illinois, Vienna quadrangle : topography Maps; Topographic maps; Topography; Illinois; Vienna (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1916."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."
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