Birch bark is not a living organism, however the birch tree,
where birch bark comes from, is.
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Claes Birch has written:
'Claes Birch'
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Birch is much harder.
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hard
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The family name of birch is Betula .There are a number of birch
native to The USA the best is probably Betula papyrifera the paper
birch or canoe birch.