Villegas, L. M.,  <br/><br/>
Soil sampling / 
L. M. Villegas and J. Calabio 
 - Los Banos :  International Rice Research Institute,  [Date of publication not identified] 
 -  illustrations ;  21 cm 
 - Rice Production Training Series .
 - Rice Production Training Series .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soils --Sampling
<br/><br/><label>LC Class. No.: </label>S593 V55