Othman Yaacob <br/><br/>
Fertility studies on old-rubber soils, Othman Yaacob 

 - Serdang, College of Agriculture, Malaya , 1970 
 - 32 p. 
 - Research publication no. 6 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fertilization - Plants, Soils - Fertilization