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	1.	No cover image available No cover image available No cover image available Stages in the evolution of plant species by Clausen, Jens Christian ill Material type: Text; Format: print ; Literary form: Not fiction Publication details: New York ; Hafner Publishing Company ; 1962 Availability: No items available. Add to cart (remove)
	2.	No cover image available No cover image available No cover image available Experimental studies on the nature of species by Clausen, Jens Christian ill Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington, D.C. ; Carnegie Institution of Washington ; 1940 Availability: No items available. Add to cart (remove)
	3.	No cover image available No cover image available No cover image available Experimental studies on the nature of species by Clausen, Jens Christian ill Material type: Text; Format: print ; Literary form: Not fiction Publication details: Washington, D.C. ; Carnegie Institution of Washington ; 1949 Availability: No items available. Add to cart (remove)

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