85 然而对格陵兰的经济来说很不幸，因为这些运输经常不能完成。见第5章。86 见第2章。87 见第4章。
88 See‘The Discovery of an Early Bearing Dial’ by Carl B. Söver in Journal of the Institute of Navigation, VI, no.3（July 1953）, pp. 294–296；and‘The Course for Greenland’ by G.J. Marcus in Saga-Book of the Viking Society, vol. XIV（1953–7）, pp. 12–35.
