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  1. By: Engell, Magnus Cornelius, - Porsild, Morten P. (Morten Pedersen),
    Publication info: København, B. Lunos, 1909
    Holding Institution: University of Toronto - Robarts Library
  2. By: Porsild, Morten P. (Morten Pedersen),
    Publication info: Kjøbenhavn, B. Lunos Bogtr, 1902
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  3. By: Porsild, Morten P. (Morten Pedersen), - Porsild, A. E.
    Publication info: København, B. Lunos bogt, 1920 [i.e. 1926]-
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden
  4. By: Fernald, Merritt Lyndon, - Blake, S. F. (Sidney Fay), - Allen, John A. (John Alpheus), - Bissell, Charles Humphrey, - Bragg, Laura M., - Briggs, Le Baron Russell, - Britton, Nathaniel Lord, - Frothingham, Louis A., - Gaskin, Helen C., - Gilmore, Melvin R. (Melvin Randolph), - Goodale, George L. (George Lincoln), - Gould, John Mead, - Graves, Arthur Harmount, - Greene, Jerome D. (Jerome Davis), - Haliburton, John P., - Holm, Theodor (Herman Theodor), - Houghton, George M., - Jones, Vincent S., - Kennedy, George G. (George Golding), - Knowlton, Clarence Hinckley, - Latham, Harold Strong, - Lewis, Eleanor Ashton, - Linder, David H. (David Hunt), - Lindsay, Eugene, - Livingston, Burton E. (Burton Edward), - Lowell, A. Lawrence (Abbott Lawrence), - Macoun, James Melville, - Mercer, James W., - Moore, George T. (George Thomas), - Noyes, George Rapall, - O'Mara, May A., - Osborn, Henry Leslie, 1857-1940, - Pease, Arthur Stanley, - Piccott, Archibald W., - Porsild, Morten P. (Morten Pedersen), - Pray, James Sturgis, - Rackemann, Francis M. (Francis Minot), - Rand, Benjamin, - Rich, William Penn, - Riddell, John M., - Robertson, I C - Rollins, Reed C. (Reed Clark), - Rose, A. McKinley, - Rose, Albert S., - St. John, Harold, - Tanner, Kenneth J., - Taylor, John Lewis, - Transeau, Edgar Nelson, - Twenhofel, William H. (William Henry), - Watson, Sereno, - Weatherby, Charles Alfred, - Whalen, Elizabeth, - Williams, Emile Francis,
    Publication info: [1890-1951]
    Holding Institution: Harvard University Botany Libraries
  1. By: Porsild, Morten P. (Morten Pedersen),
    Type: Article
    In: Rhodora
    Volume: 33
    Date: 1931
    Page Range: 213--222
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Porsild, Morten P. (Morten Pedersen),
    Type: Correspondence
    In: Merritt Lyndon Fernald correspondence
    Date: 1919-07-03
    Publication Info: [1890-1951]
  3. By: Porsild, Morten P. (Morten Pedersen),
    Type: Correspondence
    In: Merritt Lyndon Fernald correspondence
    Date: 1919-05-30
    Publication Info: [1890-1951]
  4. By: Porsild, Morten P. (Morten Pedersen),
    Type: Article
    In: Journal of mammalogy
    Volume: 3
    Date: 1922
    Page Range: 8--13
    Publication Info: Baltimore, Md, American Society of Mammalogists,