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Det Kongelige Danske videnskabernes selskabs skrifter ser. 7, b. 4 (1907-1908)
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Revision of the American species of Dryopteris of the group of D. Opposita / by Carl Christensen
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By: Christensen, Carl,
Type: Article
In: Det Kongelige Danske videnskabernes selskabs skrifter. Naturvidenskabelig og mathematisk afdeling
Volume: ser. 7, b. 4 (1907-1908)
Series: 7
Date: 1907-1908
Page Range: 247-336
Publication info: København,