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To those who worry about the durability of electronic media (and yes, it is a problem), I would point out that dt books don't always last all that well. University libraries have to invest a lot in conservation and it is not easy. The older books -- handwritten on vellum or printed on rag paper -- last better than those on many modern papers with high acid content.
I have had to throw away some paperbacks that I've had for 40 or 50 years because of severe deterioration of the paper.
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