Ebinger. J. E.. and H. F. Thut. 



1970. Woody plants of east central Illinois. 135 p.. illus. Kendall/Hunt 

 Publishing Co., Dubuque. Iowa. 

 Miller. Robert Barclay, and L. R. Tehon. 



1929. The native and naturalized trees of Illinois. 111. Nat. Hist. Surv. 

 Bull. vol. 18. artic. 1, 339 p.. illus. (maps). Urbana. (Out of print.) 

 Mohlenbrock, Robert H. 



1973. Forest trees of Illinois. New ed. 178 p.. illus. 111. Dep. Conserv.. 

 Div. For.. Springfield. 

 Tehon. Leo R. 



1942. Fieldbook of native Illinois shrubs. 111. Xat. Hist. Surv. Man. 3, 

 307 p., illus. (part col., maps). 



Indiana 



See also: McCurdy. Dwight R., William Greg Spangenberg. and 

 Charles Paul Doty 1972 E. 



Deam, Charles C. 



1932. Shrubs of Indiana. 2d ed. Indiana Dep. Conserv. Publ. 44. rev., 

 380 p., illus. (maps). 

 Deam, Charles C, and Thomas Edward Shaw. 



1953. Trees of Indiana. Indiana Dep. Conserv. Publ. 13a, rev. 3d ed. 

 329 p., illus. (maps). 

 Shaw. T. E. 



1968. Fifty common trees of Indiana. Rev. 63 p.. illus. Purdue Univ. 

 Dep. Nat. Resour. and Indiana State Dep. For. and Conserv. 



Iowa 



Aikman. J. M., and Ada Hayden. 



1938. Iowa trees in winter. Iowa State Col. Ext. Serv. Ext. Circ. 246, 

 72 p., illus. 

 Campbell, Richard B. 



1956. Trees of Iowa. Iowa State Univ. Agric. Exp. Stn. Bull. P 121, 

 62p., illus. Ames. (Rev. 1961. Out of print.) 

 Harrington. Harold D. 



1934. The woody plants of Iowa in winter condition. Univ. Iowa 

 Studies in Xat. Hist. vol. 16. no. 1, 116 p., illus. The University, 

 Iowa City. 

 Iowa State Conservation Commission. 



1970. Simple key to Iowa trees. [4] p., illus. Des Moines. 

 Prestemon, Dean, and Paul Wray. 



1965. Key for trees of Iowa. Iowa State Univ. Coop. Ext. Serv. F-282 

 (rev.). 16 p.. illus. Ames. (Reprinted 1975.) 



Tarr, Margherita, and R. R. Rothacker. 



1966. Landscape plants for Iowa. Iowa State Univ. Coop. Serv. 

 Pm-212 (rev.), 24 p., illus. Ames. (Reprinted 1975.) 



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