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Illinois Maps Topograp... (1)
Oregon (Ill.); Illinoi... (1)

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1. Illinois (Iroquois County), Cissna Park quadrangle Illinois (Iroquois County), Cissna Park quadrangle Illinois; Maps; Topographic maps; Topography; Cissna Park (Ill.); Iroquois County (Ill.) 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1939."; "Contour interval 10 feet."
2. Illinois, Oregon quadrangle. Illinois, Oregon quadrangle. Oregon (Ill.); Illinois; Maps; Topographic maps; Topography 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1921-1922"; "Contour interval 20 feet."; Coordinates: (W 89⁰30ʹ00ʺ--W 89⁰15ʹ00ʺ/N 42⁰15ʹ00ʺ--N 42⁰00ʹ00ʺ)
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