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Illinois Maps Topograp... (1)
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1. Illinois Hardinville quadrangle : topography Illinois Hardinville quadrangle : topography Illinois; Maps; Topographic maps; Topography; Hardinville (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1907-1908."; "Surveyed in cooperation with the State of Illinois."; Coordinates: (W 88⁰00ʹ00ʺ--W 87⁰45ʹ00ʺ/N 39⁰00ʹ00ʺ--N 38⁰45ʹ00ʺ)...

2. Illinois, Potomac quadrangle. Illinois, Potomac quadrangle. Potomac (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1931-1932"; "Contour interval 10 feet"; Shows roadway classification as of 1934.; (W 88⁰00ʹ00ʺ--W 87⁰45ʹ00ʺ/N 40⁰30ʹ00ʺ--N 40⁰15ʹ00ʺ)...
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