Ohio 



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

 Charles Paul Doty 1972 E. 



Braun, E. Lucy. 



1969. The woody plants of Ohio: trees, shrubs and woody climbers 

 native, naturalized, and escaped. A contribution toward the vascular 

 flora of Ohio. 362 p., illus. (maps). Hafner Publishing Co., New 

 York, London. (Reprint of 1961 ed. 362 p., illus. Ohio State Univ. 

 Press, Columbus.) 

 Dean, F. W. 



[1948?] Ohio trees together with a key to the classes, subclasses, and 

 groups of evergreen and deciduous trees of Ohio, prepared by L. C. 

 Chadwick. 127 p., illus. Ohio State Univ. Press, Columbus. 

 Vannorsdall, Harry H. 



1958. Trees of Ohio. 368 p., illus. Curtis Bookstore, Wilmington, 

 Ohio. 

 Werthner, William B. 



1935. Some American trees: an intimate study of native Ohio trees. 398 

 p., illus. Macmillan Co., New York. 



Oklahoma 



See also: Williams, John E. 1973 C. 

 Phillips, George R., Frank J. Gibbs, and Wilbur R. Mattoon. 



1973. Forest trees of Oklahoma: how to know them. A pocket manual. 

 10th rev. ed. Okla. State Board Agric. For. Div. Publ. 1, 135 p., illus. 

 Oklahoma City. 



Oregon 



Benson, Gilbert Thereon. 



1930. The trees and shrubs of western Oregon. Stanford Univ., Con- 

 trib. Dudley Herb. vol. 2, 170 p. Stanford Univ. Press, Stanford 

 Univ., Calif. 

 Engstrom, W. H. 



1971. Flowering shrubs native to western Oregon. Rev. 3d. ed. 14 p., 

 illus. Oreg. State For. Dep., Salem. 

 Engstrom, W. H. 



1973. Identification key to the common native evergreen trees of 

 Oregon. 9 p. Oreg. State For. Dep., Salem. 

 Gilkey, Helen M., and Patricia L. Packard. 



1962. Winter twigs: a wintertime key to deciduous trees and shrubs of 

 northwestern Oregon and western Washington. Oreg. State Univ., 

 Oreg. State Monogr. Stud. Bot. 12, 109 p., illus. Corvallis. 



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