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Rehder, Alfred and Ernest H. Wilson. 1928. Enumeration of the Ligneous Plants Collected by J. F. Rock on The Arnold Arboretum Expedition to Northwestern China and Northeastern Tibet. Journal of the Arnold Arboretum 9(1): 4-27; 9(2&3): 37-125. Arnold Arboretum Library, JP. RVIIIF1-7t.
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