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Illinois Maps Topograp... (1)
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1. Wisconsin-Illinois, Monroe quadrangle : topography Wisconsin-Illinois, Monroe quadrangle : topography Monroe; Wisconsin; Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1919-1920."; "Surveyed in cooperation with the States of Wisconsin and Illinois."; "Contour interval 20 feet."

2. Illinois, Dongola quadrangle Illinois, Dongola quadrangle Illinois; Maps; Topographic maps; Topography; Dongola (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1919-1920, in cooperation with the State of Illinois."; "Contour interval 20 feet."

3. 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."

4. Illinois, Barrington quadrangle Illinois, Barrington quadrangle Illinois; Maps; Topographic maps; Topography; Barrington (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1919-1920."
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