Terence Armstrong: The Northern Sea Roule. Soviet Exploilation of the North East Passage. Scott Polar Research Institute, Special Publication no. 1. Cambridge University Press. 1952. 17 X 24 cm. 162 sider. 21 sh. R. Steen Sleensen: Den nordlige søvej. Erik Lundsgaards Forlag. København 1957. 14X2lV2cm. 503 sider. Kr. 32,50. - Kingo Jacobsen., N. (Geografisk Tidsskrift, 1958)