IRRIGATION OPERATION & MAINTENANCE 

 - United States : USBR,  1966 
 - 26p ; illus. 
 - US. Dept. of the Interior, Bulletin No. 58 .
<br/><br/><br/>ENG 
<br/><br/><label>Subjects--Topical Terms: </label><br/>IRRIGATION.<br/>Operation and Maintenance.