Core, Earl L., and Roland L. Guthrie. 



1968. Common forest trees of West Virginia: how to know them. A 

 pocket manual. 6th ed. 119 p., illus. W. Va. Dep. Nat. Resour., 

 Charleston. 



Wisconsin 



Goff, F. G., and P. H. Zedler. 



1965. Wisconsin trees: a picture key. 14 p., illus. Univ. Wis. Ar- 

 boretum, Madison. 

 McNeel, W. 



1955. Learning to know common Wisconsin trees. Wis. Agric. Col. 

 Ext. Serv. Circ. 435 rev., 11 p., illus. 

 Shenefelt, R. D., comp. 



1970. A key to Wisconsin trees. 93 p., illus. Wis. Dep. Nat. Resour., 

 Madison. 

 Wilde, S. A. 



1953. Trees of Wisconsin: their ecological and silvicultural silhouettes. 

 44 p., illus. IJniv. Wis. Soils Dep. and Wis. Conserv. Dep., Madison. 

 Wilson, F. G. 



1974. Forest trees of Wisconsin: how to know them. Wis. Dep. Nat. 

 Resour. Publ. 2, 69 p., illus. Madison. (Reprinted.) 



Wyoming 



Porter, C, L. 



1959. Wyoming trees. Univ. Wyo. Agric. Ext. Serv. Circ. 164, 54 p., 

 illus. Laramie. 

 Shaw, Richard J. 



1964. Trees and flowering shrubs of Yellowstone and Grand Teton 

 National Parks. 50 p., illus. (col.). Wheelwright Press, Salt Lake 

 City, Utah. 

 Zink, Robert C. 



1952. Trees and shrubs of Grand Teton National Park. Edited by Carl 

 E. Jepson. Jackson Hole Mus. Assoc. Mus. Bull. 2, 104 p., illus. In 

 cooperation with the National Park Service. 



J. SPECIAL LISTS (CROSS REFERENCES) 

 J. a. Identification in Winter 



Several references are devoted to identification of woody plants in 

 winter from vegetative parts such as twigs, buds, and bark. In that 

 season, flowers are absent and leaves (except in evergreens) and fruits 

 are usually lacking. Some other publications also have supplemental keys 



48 



