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  1. 1
    by Mustonen, Seppo
    Published 1964
    Helsinki, 1964.
    47, [1] p. illus. 23 cm.
  2. 2
    by Järveläinen, Martti
    Published 1974
    Helsinki, Finland : Helsinki University of Technology, Dept. of Chemistry, 1974.
    28 p. : ill. ; 25 cm.

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