Robins, S.S. 2001. Effects of perennial plant competition on the invasibility of canyon grassland communities by Centaurea solstitialis. Moscow, ID: University of Idaho. Thesis. 48 p.

Robins, S.S. 2001. Effects of perennial plant competition on the invasibility of canyon grassland communities by Centaurea solstitialis. Moscow, ID: University of Idaho. Thesis. 48 p.