Smith J R <br/><br/>
Tree crops: A permanent agriculture 

 -  1953 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>56208 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Forestry<br/>Agriculture
<br/><br/><label>Dewey Class. No.: </label>JB, J3