Baerg, Harry J. <br/><br/>
How to know the western tress. 

 - 2nd ed. 
 - Dubuque, Iowa :  W.M.C. Brown,  1973. 
 - Pictured key nature series .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Taxonomía
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Texto