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2“... half of the seventeenth century, however, trading navigation to Ob Bay was brought to a standstill...”
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4by Alexandrov, Vitali Yu., Sandven, Stein, Johannessen, Ola M., Pettersson, Lasse H., Dalen, Øyvind“...Abstract The results are presented of the first winter ice navigation demonstration, using...”
Published in Polar Record (2000)
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5“... navigation season, when 16 freighters took part (Belov, 1959, p 379). At the other end of the sea route...”
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6“... navigation guide. Winter operations continued in the Kara Sea, albeit reduced, and a limited number of summer...”
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