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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
    by Siirala, Sirkka, 1909-
    Published 1969
    [Helsinki, 1969]
    (2), 79, (1) p. tables 25 cm.

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