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Koch, J.P. (1914), "Captain Koch's Crossing of Greenland.", Bulletin of the American Geographical Society, 46 (5): 356–360, doi:10.2307/201816, JSTOR201816
Koch, J.P. (1914), "Captain Koch's Crossing of Greenland.", Bulletin of the American Geographical Society, 46 (5): 356–360, doi:10.2307/201816, JSTOR201816