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Please read BHL's Acknowledgment of Harmful Content
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  1. By: National Arboretum (U.S.) - American Horticultural Society. - United States. Agricultural Research Service.
    Edition: Rev. 1965.
    Publication info: Washington, D.C, Agricultural Research Service, [1965]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: American Horticultural Society.
    Publication info: [S.l, The Society], 1885-1888
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library