Thonner, Franz. <br/><br/>
Thonner's analytical key to the families of flowering plants / 
R. Geesink ... [et al.]. 
 - Wageningen :  PUDOC,  1981. 
 - xxvi, 231p.  ill.  24cm 
<br/><br/><label>ISBN: </label>9022007448 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Botany--Classification<br/>Angiosperms