Flora of Colorado, Rydberg, Per Axel, 1860-1931 creator text book Fort Collins, Col., Experiment Station, 1906. 1906
print
ENG Botany Colorado S41 .E8 Bulletin (Colorado Agricultural Experiment Station) ;, 100. https://www.biodiversitylibrary.org/bibliography/57252 1577518 06041306 10.5962/bhl.title.57252 DLC