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

2. Illinois, Lena quadrangle : 15-minute series Illinois, Lena quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Lena (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1909, 1922, 1936, 1937 and 1942"; "Contour interval 20 feet"; Shows roadway classification as of 1942.; Coordinates: (W 90⁰00ʹ00ʺ--W 89⁰45ʹ00ʺ/N...
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