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1. Illinois (La Salle County), Ottawa quadrangle : topography. Illinois (La Salle County), Ottawa quadrangle : topography. Ottawa (Ill.); La Salle County (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1912."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."
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