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1. Hutsonville quadrangle, Illinois-Indiana : 15 minute series (topographic) Hutsonville quadrangle, Illinois-Indiana : 15 minute series (topographic) Illinois; Maps; Topographic maps; Topography; Hutsonville; Indiana Relief shown by contours and spot heights.; "Topography in Illinois from aerial photographs by Kelsh plotter, Aerial photographs taken 1956. Field check 1957, Topography in Indiana by planetable surveys...

2. McLean quadrangle, Illinois : 15 minute series (topographic) McLean quadrangle, Illinois : 15 minute series (topographic) McLean (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1940-1941. Topography by plane-table methods, 1926, 1930, 1945, and 1949."; "Contour interval...
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