Urbana, IL: Illinois Department of Registration and Education, 1955.
Softcover. Very Good. Bulletin of the Illinois Natural History Survey, Volume 26, Article 5, August 1955. pp. 367-446, with b/w illustrations from photographs, maps, literature cited, in original wrappers. Light soiling, shelf wear, and nibbling to wrappers; text clean. Includes information about climate, physiography and geology, vegetation, flora, and other topics.