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

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1. Illinois (Iroquois county), Gilman quadrangle : 15-minute series Illinois (Iroquois county), Gilman quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Gilman (Ill.); Iroquois County (Ill.) Relief shown by contours and spot heights.; "Mapped by the Geological Survey 1943-1944."; "Contour interval 10 feet."

2. Illinois, Elmwood quadrangle : 15-minute series Illinois, Elmwood quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Elmwood (Ill.) Relief shown by contours and spot heights.; "Mapped by the Geological Survey 1943-1944"; "Contour interval 20 feet"
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