Rydberg, Per Axel,  1860-1931, <br/><br/>
Flora of Colorado, / 
by P.A. Rydberg, Ph.D. 
 - xxii, 448 pages  24 cm. 
 - Colorado. Agricultural experiment station.  Bulletin 100 .
 - Bulletin (Colorado Agricultural Experiment Station) ;  100. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany--Colorado
<br/><br/><label>LC Class. No.: </label>S41  / .E8