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1. 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...

2. 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)

3. Illinois, Decatur quadrangle Illinois, Decatur quadrangle Illinois; Maps; Topographic maps; Topography; Decatur (Ill.) Relief shown by contours and spot heights.; "Contour interval 10 feet"; "Surveyed in 1929"; Shows roadway classification as of 1932.; Coordinates: (W 89⁰00ʹ00ʺ--W 88⁰45ʹ00ʺ/N 40⁰00ʹ00ʺ--N 39⁰45ʹ00ʺ)...

4. Illinois, Tallula quadrangle : topography Illinois, Tallula quadrangle : topography Maps; Topographic maps; Topography; Illinois; Tallula (Ill.) Relief indicated by contours and spot heights.; "Surveyed in 1906-1907."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 10 feet."; Coordinates: (W 90⁰00ʹ00ʺ--W 89⁰45ʹ00ʺ/N...

5. Maroa quadrangle, Illinois : 15 minute series (topographic). Maroa quadrangle, Illinois : 15 minute series (topographic). Maroa, Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Topography from aerial photographs by Kelsh plotter and by planetable surveys 1956-1957. Aerial photographs taken 1956."; "Contour interval 10 feet."; Coordinates:...

6. 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)...

7. 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)

8. Niantic quadrangle, Illinois : 15 minute series (topographic). Niantic quadrangle, Illinois : 15 minute series (topographic). Niantic (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1950. Topography by plane-table surveys 1954."; "Contour interval 10 feet."; Coordinates:...

9. Illinois, Virginia quadrangle Illinois, Virginia quadrangle Maps; Topographic maps; Topography; Illinois; Virginia (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1928 and 1932."; "Contour interval 10 feet."; Shows roadway classification as of 1935.; Coordinates: (W 90⁰15ʹ00ʺ--W 90⁰00ʹ00ʺ/N 40⁰00ʹ00ʺ--N...
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