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See the Vindolanda tablets as another example of preserved records on wood. These date from the Roman occupation of Britain.
Yes a buried piece of wood, or other biological tissue, could survive for thousands of years without decomposing. While the conditions for this are rather specific; anaerobic and antiseptic environment or at least one which limits microbial growth. These conditions can be found in a quite few situations; tar pits, bogs, the Arctic/Antarctic, some deserts ...
Cumans Kypchak people converted their religion to islam in the end of 17.century with press
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