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 Image: Title: Subject: Description:

1. Erie quadrangle, Illinois : 15 minute series (topographic) Erie quadrangle, Illinois : 15 minute series (topographic) Illinois; Maps; Topographic maps; Topography; Erie (Ill.) Relief shown by contours and spot heights.; "Topography from aerial photographs by Kelsh plotter and by plane-table surveys 1952. Aerial photographs taken 1951"; "Contour interval 10 feet."

2. 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...

3. Kenney quadrangle, Illinois : 15 minute series (topographic) Kenney quadrangle, Illinois : 15 minute series (topographic) Illinois; Maps; Topographic maps; Topography; Kenney (Ill.) Relief shown by contours and spot heights.; "Topography from aerial photographs by Kelsh plotter and by planetable surveys 1957. Aerial photographs taken 1956."; "Contour interval 10 feet."

4. Maroa quadrangle, Illinois : 15 minute series (topographic). Maroa quadrangle, Illinois : 15 minute series (topographic). Maroa, Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Topography from aerial photographs by Kelsh plotter and by planetable surveys 1956-1957. Aerial photographs taken 1956."; "Contour interval 10 feet."; Coordinates:...
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