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  1. By: Olsson-Seffer, Pehr Hjalmar, - Olsson-Seffer, Pehr Hjalmar,
    Publication info: Rock Island, Ill, Augustana Book Concern, Printers, 1910
    Holding Institution: Multiple institutions
  2. By: Olsson-Seffer, Pehr Hjalmar,
    Publication info: Singapore, Kelly & Walsh, 1907
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  3. By: Olsson-Seffer, Pehr Hjalmar,
    Publication info: Singapore, Kelly & Walsh, Ltd., printers, 1907
    Holding Institution: University of California Libraries
  1. By: Olsson-Seffer, Pehr Hjalmar,
    Type: Article
    In: Journal of botany, British and foreign
    Volume: 42
    Date: 1904
    Page Range: 262-269
    Publication Info: London, Robert Hardwicke, 1863-1942
  2. By: Olsson-Seffer, Pehr Hjalmar,
    Type: Article
    In: Botanical gazette
    Volume: 39
    Issue: 3
    Date: 1905
    Page Range: 179--192
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991