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Illinois Maps Topograp... (1)
Illinois Maps Topograp... (1)

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1. Illinois, Dongola quadrangle Illinois, Dongola quadrangle Illinois; Maps; Topographic maps; Topography; Dongola (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1919-1920, in cooperation with the State of Illinois."; "Contour interval 20 feet."

2. Illinois, Duquoin quadrangle Illinois, Duquoin quadrangle Illinois; Maps; Topographic maps; Topography; Du Quoin (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1924"; "Contour interval 20 feet."
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