Preston, Richard Joseph. <br/><br/>
North american trees  : exclusive of Mexico and tropical United States 

 - 3 ed. 
 - Ames, Iowa :  State University,  1976 
 - 399 p. 
<br/><br/><label>LCCN: </label>54164 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Árboles--Canada.<br/>Árboles--E.U.A.<br/>Árboles--Identificación.
<br/><br/><label>Dewey Class. No.: </label>582.16  / P7 1976