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

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1. Illinois, Joliet quadrangle : topography Illinois, Joliet quadrangle : topography Illinois; Maps; Topographic maps; Topography; Joliet (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1920."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 10 feet."

2. Kentucky-Illinois Golconda quadrangle : topography Kentucky-Illinois Golconda quadrangle : topography Illinois; Maps; Topographic maps; Topography; Golconda; Kentucky Relief shown by contours and spot heights.; "Surveyed in 1914, 1916 and 1920."; "Surveyed in cooperation with the States of Kentucky and Illinois."; "Contour interval 20 feet."; Coordinates: (W 88⁰30ʹ00ʺ--W...
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