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1. 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:...

2. Paxton quadrangle, Illinois : 15 minute series (topographic). Paxton quadrangle, Illinois : 15 minute series (topographic). Paxton (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1954. Topography by planetable surveys 1924, Revised 1956-1957"; "Contour interval 10 feet."...
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