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1. Illinois-Wisconsin, Grays Lake quadrangle : topography Illinois-Wisconsin, Grays Lake quadrangle : topography Illinois; Maps; Topographic maps; Topography; Grays Lake (Ill.); Wisconsin Relief shown by contours and spot heights.; "Surveyed in 1919-1920."; "Surveyed in cooperation with the States of Illinois and Wisconsin."; "Contour interval 10 feet."
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