Crop production :  annual report of the National research programs. 

 - Washington, D.C. :  U.S. Department of Agriculture, Science and Education Administration,  1979 
 - Various Pagings :  27 cm. 
<br/><br/>Includes Index 
 = Crop production. Annual report of the National research programs 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plants, Cultivated<br/>Crop yields<br/>Plant breeding<br/>Agriculture--Research--United States
<br/><br/><label>Dewey Class. No.: </label>631.050973