Working with John Adolph Shafer in 1912, León was able to expand the range of his collecting.
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After Baker left Cuba, León corresponded extensively with Nathaniel Lord Britton at the New York Botanical Garden, grass specialists A. S. Hitchcock and Mary Agnes Chase at the United States Department of Agriculture, and fern specialist William Ralph Maxon at the United States National Museum.
Leon Trotsky | León | Kings of Leon | Nuevo León | Leon Russell | León, Guanajuato | Jean-Léon Gérôme | Kingdom of León | Leon | Saint-Pol-de-Léon | Leon René | Leon Lai | Léon Blum | Leon Redbone | León, Nicaragua | Angelu de Leon | Province of León | Leon County, Florida | Leon Battista Alberti | León, Spain | Leon Panetta | Kings Of Leon | Juan Ponce de León | André Leon Talley | Oscar D'León | Leon Ware | Leon Morris | León Gieco | Leon Dewan | Leon Botstein |