Preece, W. H. A. <br/><br/>
North American rock plants / 
illustrated with photographs by A. Nicholls 
 - New York :  The MacMillan co.,  1937 
 - xv, 204 p., láms. 
<br/><br/><label>Subjects--Index Terms: </label>BOTANICA SISTEMATICA FLORES ESPECIES 
<br/><br/><label>Index Terms--Genre/Form: </label><br/>TEXTO