Cooper, William S Pearson, Gustaf A Shantz, Homer L Zon, Raphael <br/><br/>
Conservation of renewable natural resources  some fundamental aspects of the problem 

 - New York  Kennikat press, inc.  1941 
 - vi,200p.; 22cm. 
 - Morris arboretum monographs .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Climatic cycles<br/>Climatic cycles<br/>forest problem<br/>forest problem<br/>Natural resources - United States<br/>Natural vegetation