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  1. 1
    Published 1971
    Bruxelles : Fédération des Industries Chimiques de Belgique, 1971-
    v. : ill. ; 30 cm.
  2. 2
    by Pels, Paulus Simon, 1914-
    Published 1943
    Haarlem, Erven F. Bohn, 1943.
    84 p. diagrs. 25 cm.
  3. 3
    Rotterdam : Imperial Chemical Industries,
    v. : ill.

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