Verbatim text: Clausen, J., D. D. Keck, and W. M. Hiesey. 1940. Experimental studies on the nature of species. I. Effect of varied environments on western North American plants. Publ. Carnegie Inst. Wash. 520.
Author: Clausen, J., Keck, D.D., Hiesey, W.M.
Year: 1940
Title: Experimental studies on the nature of species. I. Effect of varied environments on western North American plants
Journal: Publ. Carnegie Inst. Wash
Volume: 520