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Letachowicz,Barbara:Ekologiczna Charakterystyka Populacji Sempervivum Soboliferum Sims Na Poporzu Sudeckim.(Ecological characterization of Sempervivum soboliferum Sims population in Sudetic Foothills.)1986. (Monogr.Bot.,vol.68).26 figs.6 tabs.61 p.gr8vo.Paper bd.-In Polish with English summary.(24155) 11.77
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