Williamson, Graham. <br/><br/>
The orchids of south central Africa 

 - London :  Dent,  1977 
 - 237 p.  : ilus. ; láms. 
<br/><br/><label>LCCN: </label>54852 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Orquidáceas.
<br/><br/><label>Dewey Class. No.: </label>584.15  / W5