Shull, George Harrison,  1874- <br/><br/>
Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids / 
Geo rge Harrison Shull. 
 - Washington, D.C. :  Carnegie Institution of Washington,  1909. 
 - 57 p. :  ill. ;  25 cm. 
 - Carnegie Institution of Washington publication ;  no.112. .
<br/><br/> "Papers of the Station for Experimental Evolution, no.12". 
<br/><br/>"Literature cited": p.57. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bursa bursa--pastoris.<br/>Bursa heegeri.<br/>Hybridization, Vegetable.
<br/><br/><label>Dewey Class. No.: </label>P 581.158 S59