U.S. Department of Agriculture <br/><br/>
Pathogenic specialization in cerealrust fungi especially puccinia recondition f. sp. tritici concepts methods of study a 

 - Washington  The Author  1971 
 - iii,51p.; 23cm.-.  
 - Tachnical bulletin, no. 1432. .
<br/><br/><label>Dewey Class. No.: </label>581.2  / U.S.