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  1. By: Porta, Pietro
    Publication info: [S.l. : s.n.], 1896
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid
  2. By: Porta, Pietro
    Publication info: Firenze : Stab. Tip. Lit. ed Elettro-Galv. di G. Pellas. 10, Via Iacomo da Diacceto, 10, 1887
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid
  3. By: Porta, Pietro
    Publication info: Rovereto : (Tipografia Giorgio Grigoletti), 1892
    Holding Institution: Biblioteca Digital del Real Jardín Botánico de Madrid