The Philippines recommends for rubber 

<br/><br/><label>ISBN: </label>971-20-0434-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Nurseries (Horticulture)<br/> Rubber processing<br/> Rubber quality<br/> Rubber testing<br/> Rubberwood<br/>Rubber industry