Relief shown by contours and spot heights. At head of map: "Committee of the Board of Natural Resources and Conservation. Frank G. Thompson, Chairman: Edsons S. Bastin, Geology: William A Noyes, Chemistry: Arthur Cutts Willard, President of the University of Illinois" & "State of Illinois, Dwight H. Green, Governor. Deptartment of Registration and Education, Frank G. Thompson, Director." "Geologically surveyed in 1930-1932." "Topographic base surveyed in cooperation with the U.S. Geological Survey, 1926; 1936." Below lower margin: A Hoen & Co. Includes legend and map index. Available also as a digital image through the Harvard University Web site. Electronic reproduction. Cambridge, Mass. : Harvard Geospatial Library, 2008 Georeferenced image for use in a GIS.
Relief shown by contours and spot heights. At head of map: "Committee of the Board of Natural Resources and Conservation. Frank G. Thompson, Chairman: Edsons S. Bastin, Geology: William A Noyes, Chemistry: Arthur Cutts Willard, President of the University of Illinois" & "State of Illinois, Dwight H. Green, Governor. Deptartment of Registration and Education, Frank G. Thompson, Director." "Geologically surveyed in 1930-1932." "Topographic base surveyed in cooperation with the U.S. Geological Survey, 1926; 1936." Below lower margin: A Hoen & Co. Includes legend and map index. Available also as a digital image through the Harvard University Web site. Electronic reproduction. Cambridge, Mass. : Harvard Geospatial Library, 2008 Georeferenced image for use in a GIS.