Sheldon, Richard P. <br/><br/>
Search for and development of undiscovered phosphate resources in Southeast Asia 
Richard P. Sheldon 
 -  1983 
 - 55 p.  ill.  30 cm 
<br/><br/>Includes bibliographical references 
<br/><br/> The countries of the humid tropical areas of the world lack the soill fertility necessary for high agricultural productivity, although water and sunlight are abundant. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Minerals