The impervious bark of the North American paper birch, formerly used by American Indians to make canoes and other items.
- Although these canoes are covered with birchbark, this skin, like that of a kayak, is stretched over a framework of ribs and spars.
- Larger cod tend to be found farther to sea, moreover, so the effect of fishing on the mean adult size of cod should have been relatively low in the era of birchbark canoes.
- Postwar aluminum canoes not only were built out of an entirely new and different material, but were also shaped by heavy-duty industrial machinery rather than crafted by hand, as were birchbark and wood and canvas canoes.
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