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  1. By: Garrett, John, - Nicholson, George, - Trail, J. W. H. (James William Helenus),
    Publication info: London :L. Upcott Gill ;1887-1889.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  2. By: Nicholson, George, - Garrett, John, - Trail, J. W. H. (James William Helenus),
    Publication info: London :L.U. Gill,[1884]-88.
    Holding Institution: Missouri Botanical Garden, Peter H. Raven Library
  3. By: Nicholson, George, - Garrett, John, - Trail, J. W. H. (James William Helenus),
    Publication info: London :L. U. Gill,[1884]-89.
    Holding Institution: University of California Libraries (archive.org)
  4. By: Trail, J. W. H. (James William Helenus), - Trail, Katherine E.,
    Publication info: Aberdeen University Press
    Holding Institution: Royal Botanic Garden Edinburgh