Valera, Alfredo Bermas <br/><br/>
A comparative assessment of three irrigation systems at Central Luzon, Philippines  [microform] / 
Alfredo Bermas Valera 
 - Ann Arbor, Mich. :  University Microfilms International,  1985 
 - 4 microfiches ;  11 x 15 cm. 
<br/><br/>Thesis (Ph.D.)-Cornel University, 1985 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Irrigation--Philippines--Luzon