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1. Illinois, Elgin quadrangle Illinois, Elgin quadrangle Illinois; Maps; Topographic maps; Topography; Elgin (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1923"; "Contour interval 10 feet."

2. 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."

3. Illinois, Marion Quadrangle Illinois, Marion Quadrangle Marion (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1923."; "Contour interval 20 feet."

4. Illinois, Harrisburg quadrangle Illinois, Harrisburg quadrangle Illinois; Maps; Topographic maps; Topography; Harrisburg (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1921 and 1923."; "Contour interval 20 feet."

5. Illinois, Joliet quadrangle : topography Illinois, Joliet quadrangle : topography Illinois; Maps; Topographic maps; Topography; Joliet (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1920."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 10 feet."

6. Illinois, Yorkville quadrangle Illinois, Yorkville quadrangle Maps; Topographic maps; Topography; Illinois; Yorkville (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1923."; "Contour interval 10 feet."

7. Illinois (Macoupin County), Carlinville quadrangle Illinois (Macoupin County), Carlinville quadrangle Illinois; Maps; Topographic maps; Topography; Carlinville (Ill.); Macoupin County (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1923."; "Contour interval 10 feet."

8. 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)

9. Illinois (Bureau County), Buda quadrangle : topography Illinois (Bureau County), Buda quadrangle : topography Illinois; Maps; Topographic maps; Topography; Buda (Ill.); Bureau County (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1921."; Contour interval 20 feet.

10. Illinois-Missouri, Jonesboro quadrangle Illinois-Missouri, Jonesboro quadrangle Illinois; Maps; Topographic maps; Topography; Jonesboro; Missouri Relief shown by contours and spot heights.; "Surveyed in 1918 and 1921"; "Contour interval 20 feet."

11. Missouri-Illinois, St. Charles quadrangle Missouri-Illinois, St. Charles quadrangle Maps; Topographic maps; Topography; Illinois; Missouri; Saint Charles (Mo.); St. Charles (Mo.) 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 1923 and 1927"; "Contour interval 20 feet"; Shows...

12. Illinois, Herscher quadrangle Illinois, Herscher quadrangle Illinois; Maps; Topographic maps; Topography; Herscher (Ill.) Relief shown by contours and spot heights.; "Control in part from railroad valuation surveys."; "Surveyed in 1922 and 1923."

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

14. Illinois, Alexis quadrangle Illinois, Alexis quadrangle Illinois; Maps; Topographic maps; Topography; Alexis (Ill.) Relief shown by contours and spot heights.; Road classification "Dec.1924."; "Surveyed in 1921 and 1923."
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