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  1. Plant hardiness zone map /
    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
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  2. Transactions of the American Horticultural Society.
    By: American Horticultural Society.
    Publication info: [S.l. :The Society],1885-1888.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
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