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The freight boats discussed, were built in Czerwinsk on the Vistula river and were used, in the first half of the 20th century, for transportation of excavated material: sand, gravel or stones. The different types of flat-bottomed boats, called respectively 'bat', 'krypa' and 'kajlak', had been perfected by boat-builders throughout centuries and were well adapted to sailing on the Vistula, a river...
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