Results of the fourth international spring wheat yield nursery, 1967 -1968.   

 - Mexico :   International Maize and Wheat Improvement Center   1971 . 
 - 12 p. :    ill ;    22 cm. 
 - CIMMYT Research Bulletin ;   no.18 .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Wheat --Varieties ------Tables --Periodicals.<br/>Wheat --Field experiments ------Tables -- Periodicals.--Periodicals.
<br/><br/><label>Subjects--Geographic Terms: </label><br/> Wheat -- Yields -- Tables -- Periodicals.