Davidson, A. G. <br/><br/>
Important forest insects and diseases of mutual concern to Canada  : The United States and Mexico 

 - Ottawa :  Queen's Printer,  1967 
 - 248 p.  : ilus. 
<br/><br/><label>LCCN: </label>70989 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Árboles--Enfermedades.<br/>Árboles--Plagas.
<br/><br/><label>Dewey Class. No.: </label>634.96  / D3