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1. Illinois, La Harpe quadrangle : topography Illinois, La Harpe quadrangle : topography Illinois; Maps; Topographic maps; Topography; La Harpe (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1916."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

2. Kentucky-Illinois, La Center quadrangle Kentucky-Illinois, La Center quadrangle Illinois; Maps; Topographic maps; Topography; Kentucky; La Center Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army."; "Surveyed in 1926 and 1928"; "Contour interval 20 feet"; Road...

3. 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."

4. Illinois, LaSalle sheet : reconnaissance map Illinois, LaSalle sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; La Salle (Ill.) Relief indicated by contours.; "Surveyed in 1891."; "Contour interval 10 feet"
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