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  1. By: Gray, Asa, - Paine, John A. (John Alsop), - Pammel, L. H. (Louis Hermann), - Parish, S. B. (Samuel Bonsall), - Parseval-Grandmaison, Jules, (Alexandre-Jules de), - Patterson, Harry N. (Harry Norton), - Perry, Matthew Calbraith, - Peters, Thomas M. (Thomas Minott), - Piper, Charles V. (Charles Vancouver),
    Publication info: [1835-1893]
    Holding Institution: Harvard University Botany Libraries