Proceedings, abstracts of papers and addresses 

 - (s.l. :  s.e.),  (s.a) 
 - 270 p 
<br/><br/><label>LCCN: </label>22142 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultura--Congresos.<br/>Agricultura--Investigacion--E.U.A.
<br/><br/><label>Dewey Class. No.: </label>630.63  / A88 1957