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1. Illinois, Mount Olive quadrangle : topography. Illinois, Mount Olive quadrangle : topography. Mount Olive (Ill.); Illinois; Maps; Topographic maps; Topography Relief indicated by contours and spot heights.; "Surveyed in 1913"; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."; Coordinates: (W 89⁰45ʹ00ʺ--W 89⁰30ʹ00ʺ/N...

2. Illinois-Indiana, Birds quadrangle : topography Illinois-Indiana, Birds quadrangle : topography Illinois; Maps; Topographic maps; Topography; Birds (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1914."; "Surveyed in cooperation with the State of Illinois."

3. Kentucky-Illinois Golconda quadrangle : topography Kentucky-Illinois Golconda quadrangle : topography Illinois; Maps; Topographic maps; Topography; Golconda; Kentucky Relief shown by contours and spot heights.; "Surveyed in 1914, 1916 and 1920."; "Surveyed in cooperation with the States of Kentucky and Illinois."; "Contour interval 20 feet."; Coordinates: (W 88⁰30ʹ00ʺ--W...

4. 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)

5. Illinois, Equality quadrangle : topography Illinois, Equality quadrangle : topography Illinois; Maps; Topographic maps; Topography; Equality (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1913-1914."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois."; Coordinates (W 88⁰30’00"--W 88⁰15’00"/N...

6. Indiana-Illinois, Vincennes quadrangle : topography Indiana-Illinois, Vincennes quadrangle : topography Maps; Topographic maps; Topography; Illinois; Indiana; Vincennes (Ind.) Relief shown by contours and spot heights.; "Surveyed in 1911-1913."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."; Coordinates: (W 87⁰45ʹ00ʺ--W 87⁰30ʹ00ʺ/N...

7. Illinois-Wisconsin, McHenry quadrangle Illinois-Wisconsin, McHenry quadrangle Illinois; Maps; Topographic maps; Topography; McHenry (Ill.) Relief shown by contours and spot heights.; "Control in part from railroad valuation surveys, Surveyed in 1924"; "Contour interval 10 feet."
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