"Scott Polar Research Institute." . . "Sowjetunion." . . "Geschichte." . . "Arctic Ocean" . . . . "Wirtschaftsentwicklung." . . "Russia. Glavnoe upravlenie Severnogo morskogo puti." . . "Entdeckungsreise." . . . . . . . . . "The Northern Sea route : Soviet exploitation of the North East Passage" . "The Northern Sea route : Soviet exploitation of the North East Passage"@en . . "The Northern Sea route : Soviet exploitation of the north east passage" . . . . "The Northern Sea Route : Soviet exploitation of the North East Passage" . . . . . . . . . . . . . . . . "The Northern Sea Route. Soviet exploitation of the North East passage"@en . . "The northern sea route: Soviet exploitation of the North East Passage" . . . . "The northern sea route. Soviet exploitation of the north east passage" . . . "The Northern sea route. Soviet exploitation of the North East passage. [With plates, including portraits, maps and a bibliography.]"@en . "The northern sea route : Soviet exploitation of the North East Passage"@en . "The northern sea route : Soviet exploitation of the North East Passage" . . "The northern sea route; Soviet exploitation of the North East Passage" . . . . "The northern sea route : soviet exploitation of the north east passage" . "The northern sea route Soviet exploitation of the North East Passage"@en . . . . . . "Noordelijke IJszee." . . "Northeast Passage." . . "Erforschung." . . "Forschungsreise." . . "Sovjet-Unie." . . "Nordostpassage." . . "Northwest Passage." . .