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1. McLean quadrangle, Illinois : 15 minute series (topographic) McLean quadrangle, Illinois : 15 minute series (topographic) McLean (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1940-1941. Topography by plane-table methods, 1926, 1930, 1945, and 1949."; "Contour interval...

2. Illinois, Havana quadrangle Illinois, Havana quadrangle Illinois; Maps; Topographic maps; Topography; Havana (Ill.) Relief shown by contours and spot heights.; "Control in part by Illinois River Commission and Corps of Engineers U.S. Army."; "Surveyed in 1922-1923."; "Contour interval 20 feet." Coordinates: (W 90⁰15ʹ00ʺ--W...

3. Illinois, Potomac quadrangle. Illinois, Potomac quadrangle. Potomac (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1931-1932"; "Contour interval 10 feet"; Shows roadway classification as of 1934.; (W 88⁰00ʹ00ʺ--W 87⁰45ʹ00ʺ/N 40⁰30ʹ00ʺ--N 40⁰15ʹ00ʺ)...

4. Illinois, Colchester quadrangle : topography Illinois, Colchester quadrangle : topography Illinois; Maps; Topographic maps; Topography; Colchester (Ill.) Relief shown by contours.; "Contour interval 20 feet."; "Surveyed in 1911."; Coordinates: (W 91⁰00ʹ00ʺ--W 90⁰45ʹ00ʺ/N 40⁰30ʹ00ʺ--N 40⁰15ʹ00ʺ)

5. Illinois, Mackinaw quadrangle Illinois, Mackinaw quadrangle Illinois; Maps; Topographic maps; Topography; Mackinaw (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1927-1928"; "Contour interval 10 feet"; Shows roadway classification as of 1931.; Coordinates: (W 89⁰30ʹ00ʺ--W 89⁰15ʹ00ʺ/N 40⁰45ʹ00ʺ--N...

6. Illinois (Warren County), Monmouth quadrangle Illinois (Warren County), Monmouth quadrangle Monmouth (Ill.); Warren County (Ill.); Illinois; Maps; Topographic maps; Topography "Contour interval 20 feet."; "Surveyed in 1920-1921."; "Surveyed in cooperation with the State of Illinois." Coordinates: (W 90⁰45ʹ00ʺ--W 90⁰30ʹ00ʺ/N 41⁰00ʹ00ʺ--N 40⁰45ʹ00ʺ)
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