Having established two years earlier, what is to become Norway's largest industrial park at Herøya outside Porsgrunn, Norsk Hydro opens up its first plant in this location.
^Berton, Pierre. The Arctic Grail: The Quest for the North West Passage and the North Pole. Toronto: Random House of Canada Ltd., 1988, p. 629.
^Haverkamp, Frode Ernst. "Annasif Døhlen". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 18 June 2021.
^Larsen, Svend Erik Løken. "Elsa Lystad (norsk skuespiller)". In Bolstad, Erik (ed.). Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 3 July 2021.
^Bolstad, Erik (ed.). "Arne Vinje Gunnerud". Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 23 June 2021.
^Birkeland, Tone. "Aase Foss Abrahamsen". In Helle, Knut (ed.). Norsk biografisk leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 13 October 2017.
^Bolstad, Erik (ed.). "Knut Helle". Store norske leksikon (in Norwegian). Oslo: Norsk nettleksikon. Retrieved 1 September 2022.
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