Vezina, Paul E. <br/><br/>
More about the crown competition factor 

<br/><br/> Sobretiro de: The Forestry Chronicle. 39(3):313-317, 1963 
<br/><br/><label>LCCN: </label>49230 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Árboles--Corona.