Gagnon, J. D. <br/><br/>
Relationship between site index and foliage nitrogen at two crown levels for mature black spruce 

<br/><br/> Sobretiro de : The Forestry Chronicle. 40(2): 169-174, 1964 
<br/><br/><label>LCCN: </label>70947 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nitrógeno en plantas.<br/>Picea mariana.