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university-of-illinois-urbana-champaign

2. Illinois, Dixon quadrangle : topography

1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1916.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma...
university-of-illinois-urbana-champaign

3. Illinois, Good Hope quadrangle : topography

1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1916.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma...
university-of-illinois-urbana-champaign

4. Illinois, Kings quadrangle : topography

1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1917.";"Surveyed in cooperation with the War Department and the State of Illinois.";Relief shown by contours...
university-of-illinois-urbana-champaign

5. Illinois, Kirkland quadrangle : topography

1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1917.";"Surveyed in cooperation with the War Department and the State of Illinois.";Relief shown by contours...
university-of-illinois-urbana-champaign

6. Illinois, La Harpe quadrangle : topography

1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1916.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma...
university-of-illinois-urbana-champaign

7. Illinois, Morris quadrangle : topography

1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1915.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma...
university-of-illinois-urbana-champaign

8. Illinois, Wilmington quadrangle : topography

1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1916.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma...
university-of-illinois-urbana-champaign

9. Illinois-Missouri, Campbell Hill quadrangle : topography

1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1915-1916.";"Surveyed in cooperation with the States of Illinois and Missouri."; (W 89⁰45ʹ00ʺ--W 89⁰30ʹ00ʺ/N...
university-of-illinois-urbana-champaign

10. Illinois-Wisconsin, Belvidere quadrangle : topography

1918. Geological Survey (U.S.). Surveyed in 1917.;Surveyed in cooperation with the War Department and the State of Illinois.";Relief shown by contours and spot heights.;1 map, col...