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  1. 1
    by Brenner, Thord Johannes
    Published 1931
    Helsinki-Helsingfors, Imprimérie de l'état, 1931.
    164 p. incl. illus., diagrs. 25 cm.
  2. 2
    by Skult, Henrik
    Published 1956
    Helsingforsiae : Societas pro Fauna et Flora Fennica, 1956.
    244 p. : ill., maps ; 26 cm.
  3. 3
    by Ehnholm, Gunnar
    Published 1951
    Helsingfors, 1951.
    94, xxi p. maps, diagrs., tables. 25 cm.
  4. 4
    Helsingfors, Finska litteratursällskapets tryckeri a.-b., 1920.
    iv, 63 p., 1 l., lxvi p. incl. tables, diagrs. 29 cm.

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