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23. Flora quadrangle, Illinois : 15 minute series (topographic)

Maps University Of Illinois Urbana Champaign Public content
1949. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods 1947-1948.";... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1949. This is one in a series of 455 mid 20th century fire insurance maps produced by the Fire Insurance Rating Organization of New Jersey. Municipal Fir...