1890-1974 38 vols., Contributions from the United States National Herbarium Herbarium (1890-2006) 22 ()
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1890-1974 38 vols., Contributions from the United States National Herbarium Herbarium (1890-2006) [372]
Contr. U.S. Natl. Herb.
vol. 22 (1920) [0]