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Start Over Year 1913 Place Iowa Provider University of Illinois Urbana-Champaign

1. Illinois-Iowa Galena quadrangle : topography

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1913. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed 1909 and 1911.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot hei... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

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