Welch, D.S. <br/><br/>
The cause and treatment of cavities in trees / 
by D.S. Welch 
 - Ithaca, N.Y. :   Cornell University 
 - 6 p. 
<br/><br/> Sobretiro de: Proccedings of 25th National Shade Tree Conference, 1949 
<br/><br/><label>LCCN: </label>206053 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arboles -- enfermedades