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Verhagen, H.J. (author), Loman, G.J.A. (author)Norman Hells is situated on the north bank of the Mackenzie River, 145 km south of the Arctic Circle. The use of a pool-wide water flood system for secondary recovery and the features of the oil-bearing structure require six man-made platforms to provide vertical access to the portion of the oil pool that 1 ies beneath the Mackenzie River (60%)....report 1980
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Ramaer, J.C. (author)IJsverslag van de winter van 1916 op 1917. Geconcludeerd kan worden dat de meeste rivieren te maken hadden met vast ijs in de gehele maand februari. Er is onderzoek gedaan naar de rivieren Pannerdensch Kanaal, Neder Rijn, Lek, Nieuwe Maas, Boven-Rijn, Waal, Merwede en den Gelderschen IJssel.report 1917