Apgar, A. C.  1838-1908 <br/><br/>
Trees of the Northern United States :  Their Study, Description and Determination  [electronic resource] / 
A. C. Apgar 
 -  Project Gutenberg,  2009 
 - Project Gutenberg  29724 .
<br/><br/> Public domain in the USA. 
<br/><br/>Electronic text 
<br/><br/><label>Subjects--Index Terms: </label>Trees -- North America 
<br/><br/><label>LC Class. No.: </label>QK