Cramer, H. H. <br/><br/>
Plant protection and world crop production 

 - Pflanzenschutz  Bayer  1967 
 - 514p.  25cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crop yields
<br/><br/><label>LC Class. No.: </label>SB601.C7