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A wooden Norwegian calendar of 1457 with ship graffiti : problems relating to the source value of primitive representations of ships | Analytt | 930.26:626.02(05) I Liebgott, Niels-Knud / I: International Journal of Nautical Archaeology and Underwater Exploration. - Nr. 1, 1973 - London. - 147-158 | Liebgott, Niels-Knud | |