Ponencias 

 - New Dalhi, India :  International Commission on Irriagation and Drainage,  1969 
 - 9 v. en 10 t.  : ilus. 
<br/><br/><label>LCCN: </label>26851 
<br/><br/><label>Dewey Class. No.: </label>631.7  / C68 1969