Penn , Raymond , J. <br/><br/>
Environmental aspects of natural resource management-agriculture and soils  /    
Raymond J. Penn. 
 - Rome :   Food and Agriculture Organization Services Division ,   1 972. 
 - iv. , 39 p. ;    27 cm. 
 - FAO Agricultural Services Bulletin ;   No.14. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Man --Influence of nature.------<br/>Agriculture.--Influence of nature.------