Muenscher, Walter Conrad Leopold,  1891-1963. <br/><br/>
Keys to woody plants 

 - 6th ed., rev. 
 - Ithaca  Comstock Publishing Associates  1950 
 - 108 p. : ill. ; 20 cm. 
<br/><br/>Bibliography: p. 90-93. 
<br/><br/><label>ISBN: </label>0801403073 
<br/><br/><label>LCCN: </label>50-014257 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Trees--United States<br/>Shrubs--United States