Maroa quadrangle, Illinois : 15 minute series (topographic).
Description
Contour interval 10 feet.;"Topography from aerial photographs by Kelsh plotter and by planetable surveys 1956-1957. Aerial photographs taken 1956."; (W 89⁰00ʹ00ʺ--W 88⁰45ʹ00ʺ/N 40⁰15ʹ00ʺ--N 40⁰00ʹ00ʺ);Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500
The University of Illinois Map Library requests the following acknowledgement be included when using this Historical Map: Map provided courtesy of the Map Library at the University of Illinois at Urbana-Champaign.; No Copyright - United States; http://rightsstatements.org/vocab/NoC-US/1.0/