I don't know, but there are so many Scandinavian rock pictures of boats that they must have been familiar all over the place. There are two main types - the long lean craft with possible masts that Fitz showed us - they could be forerunners of Nydam and plank built. Then there are the second type with much higher bulwarks and the underwater projections. These I believe to be skin over framework and I have made one of these my tempoary avatar as I don't know how to post a foreign site on TMA.
Years ago, there was a wonderful book on the history of ships from dug-outs to nuclear subs. It is by Bjorn Landstrom and is beautifully illustrated. I have managed to locate a copy via Abebooks and when it arrives, I will look to see what he has to say about Neolithic and Bronze Age boats
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