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Chemotaxonomic investigations on Dryopteris fragrans

by Widén, C.-J., Britton, D. M.
Published in Canadian Journal of Botany (1971)

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Vascular Plants of Continental Northwest Territories, Canada

by Britton, D. M., Porsild, A. Erling, Cody, William J.
Published in American Fern Journal (1981)

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