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1“...), B. papyrifera Marshall (papirbirk) B. populifolia Marsh. (poppelbirk) og B. nigra L. (sortbirk) er...”
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2“.... alleghaniensis Britton (gulbirk), B. lenta L. (sukkerbirk), B. papyrifera Marshall (papirbirk) B. populifolia...”
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3“...: The Hebrides (Aa. H. Kamp) . 120McIntosh & Marshall: The Face of Scotland (V. Hansen) . 123Elhai: La propriété...”
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4“...: The Hebrides (Aa. H. Kamp) . 120McIntosh & Marshall: The Face of Scotland (V. Hansen) . 123Elhai: La propriété...”
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