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Gradstein,S.R.: A taxonomic monograph of the genus Acrolejeunea (Hepaticae)with an arrangement of the Genera of Ptychanthoideae.1975. (Meded.Bot.Mus.en Herb.Rijksuniv.Utrecht 425).24 pls.162 p.gr8vo. Paper bd.Second-hand copy. (4740) 20.00
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