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The American ferns of the group of Dryopteris opposita contained in the U.S. National museum
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The American ferns of the group of Dryopteris opposita contained in the U.S. National museum
Date:
1910
Citation:
Christensen, Carl and United States National Museum. 1910. "The American ferns of the group of Dryopteris opposita contained in the U.S. National museum." Smithsonian Miscellaneous Collections. 52 (25):365–396.
