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1. Illinois, Equality quadrangle : topography Illinois, Equality quadrangle : topography Illinois; Maps; Topographic maps; Topography; Equality (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1913-1914."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois."; Coordinates (W 88⁰30’00"--W 88⁰15’00"/N...
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