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  1. By: Wilson, Percy, - León, hermano, - Britton, Nathaniel Lord,
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
  2. By: Britton, Nathaniel Lord, - Britton, Elizabeth G. (Elizabeth Gertrude), - Cowell, John Francis, - León, hermano,
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: Women in Natural History
  3. By: Britton, Nathaniel Lord, - Britton, Elizabeth G. (Elizabeth Gertrude), - Cowell, John Francis, - León, hermano, - Earle, F. S. (Franklin Sumner),
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: Women in Natural History
  1. By: León, hermano,
    Type: Article
    In: Torreya
    Volume: 19
    Issue: 9
    Date: 1919
    Page Range: 172--173
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  2. By: León, hermano,
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 24
    Issue: 279
    Date: 1923-03
    Page Range: 49--62
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-