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Illinois Maps Topograp... (1)
Orion (Ill.); Illinois... (1)

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1. Illinois, Jacksonville quadrangle Illinois, Jacksonville quadrangle Illinois; Maps; Topographic maps; Topography; Jacksonville (Ill.) Relief shown by contours and spot heights.; Contour interval 10 feet.; Lacks vegetation tint.; "Surveyed in 1930-1932."; Shows highway classification as of 1935.

2. Illinois, Orion quadrangle. Illinois, Orion quadrangle. Orion (Ill.); Illinois; Maps; Topographic maps; Topography 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 1930-1932"; "Contour interval 20 feet."
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