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1. Illinois-Indiana, Carmi quadrangle : 15-minute series Illinois-Indiana, Carmi quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Carmi; Indiana Relief shown by contours and spot heights.; "Surveyed in 1921 and 1939-1940."; "Topography in Indiana from chart of the Wabash River by Corps of Engineers, U.S. Army."; "Contour interval 10 feet."; Coordinates:...

2. Illinois, Ina quadrangle : 15-minute series Illinois, Ina quadrangle : 15-minute series Illinois ; Maps ; Topographic maps ; Topography ; Ina (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1921, 1930, and 1937-1939."; "Contour interval 10 feet."; Road classification as of 1942.; Coordinates: (W 89⁰00ʹ00ʺ--W 88⁰45ʹ00ʺ/N 38⁰15ʹ00ʺ--N...

3. Illinois, Albion Quadrangle : 15-minute series. Illinois, Albion Quadrangle : 15-minute series. Illinois; Maps; Topographic maps; Topography; Albion (Ill.) Relief shown by contours and spot heights.; "Road classification 1945."; "Mapped by the Geological Survey 1943." Coordinates: (W 88⁰15ʹ00ʺ--W 88⁰00ʹ00ʺ/N 38⁰30ʹ00ʺ--N 38⁰15ʹ00ʺ)

4. Flora quadrangle, Illinois : 15 minute series (topographic) Flora quadrangle, Illinois : 15 minute series (topographic) Illinois; Maps; Topographic maps; Topography; Flora (Ill.) Relief shown by contours and spot heights.; "Contour interval 10 feet."; "Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods 1947-1948."; Coordinates:...
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