OKLAHOMA GEOLOGICAL SURVEY. 



Governor Lee Cruce, State Superintendent R. H. Wilson, 



President Stratton D. Brooks, Commission. 



SCIENTIFIC STAFF. 



I ). \\ . ( >hern Director 



!.. C. Snider Assistant Director 



C. W. Shannon Field Geologist 



Frank 1 Wit tram Chemist 



CIRCULAR NO. 4. 



THE TREES AND SHRUBS OF OKLAHOMA. 

 By C. W. SHANNON. 



NORMAN 

 March, 1913. 



