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Published online by Cambridge University Press: 27 October 2009
Polar Record, Vol 18, No 114, September, 1976, p 315, line 27. For (1905–07) read (1907–09).
Polar Record, Vol 18, No 115, January, 1977, p 376. Figure 2 is upside down, and in line 3 of the caption for mega seconds read micro seconds.