Rolf Nordhagen (botanist) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Rolf Nordhagen (botanist)" in English language version.

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Steenstrup, Bjørn, ed. (1973). "Nordhagen, Rolf". Hvem er hvem? (in Norwegian). Oslo: Aschehoug. p. 416. Retrieved 23 October 2019.

Berg, Rolf Y. "Rolf Nordhagen". In Helle, Knut (ed.). Norsk biografisk leksikon (in Norwegian). Oslo: Kunnskapsforlaget. Retrieved 26 December 2010.