Bentham,George and J.D. Hooker <br/><br/>
Handbook of the British flora. A description of the flowering plants and ferns 

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 - G.B.  L.Reeve & Co. Ltd.  1947 
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<br/><br/><label>Subjects--Topical Terms: </label>--Helechos--Fanerogamas--Flora--Gran Bretaņa--<br/>Botanica