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  1. 1
    by Ahlman, Kaj
    Published 1968
    Helsinki, Institute of Occupational Health; and Dept. of Pulmonary Diseases, University Central Hospital, 1968.
    48 p. illus. 25 cm.
  2. 2
  3. 3
    by Kruus, Sirkka
    Published 1971
    Helsinki, 1971.
    91 p. 25 cm.
  4. 4
    by Suoninen, Pirkko
    Published 1971
    Helsinki, 1971.
    50 p. illus.
  5. 5
    by Löfqvist, Eero
    Published 1931
    Helsingfors : Mercators Tryckeri, 1931.
    158 p. ; 23 cm.

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