Thonner`s analytical key to the families of flowering plants  Thonner, Franz,  Geesink, R.; Leeuwenberg, A. J. M.; Ridsdale, C. E 

 - Wageningen : Centre for Agricultural Pub. and Documentation ; Hague ; Boston :   Leiden University Press ; Hingham, MA : Distributors for the U.S. and Canada, Kluwer Boston  , 1981. 
 - xxvi, 231 pages   : illustrations ;   24 cm. 
<br/><br/><label>ISBN: </label>9022007308 
<br/><br/><label>Dewey Class. No.: </label>582.131012