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1882, Nineteenth Century Collections Online: Science, Technology, and Medicine: 1780-1925, Part II
Web Resource
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1907, University of California publications in botany, v. 3, no. 1
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1915, Arbejder fra den Danske arktiske station paa Disko, Volume nr. 9, 267-281
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1922, Biodiversity Heritage Library Field Notes Project.
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