On-farm research manual :  Planning on-farm research. 

 - Diliman, Quezon City :  Bureau of Agricultural Research, Department of Agriculture,  c1990. 
 - 131 p. ;  25 cm. 
<br/><br/> Includes references (p.78). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Planning research.