Eckholm, Erik P. <br/><br/>
Losing ground :  environmental stress and world food prospects / 
Erik P. Eckholm. 
 - New York :  Norton,  c1976. 
 - 223 p. 
<br/><br/><label>ISBN: </label>0393064107 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture--Environmental aspects.<br/>Food supply.<br/>Soil erosion.<br/>Nature--Effect of human beings on