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FWIW, stone tablets are not actually the last word in longevity - even pottery does better in many cases because it holds more per unit mass, so smaller pieces can be used. For a personal library where cost is an issue I suspect that a traditional movable type printing press using clay which you then fire and glaze would work well, especially if you used a metallic ink as well. You'll end up with quite bulky "books" but unless physically crushes I expect they'd be usable for a millennia or two.
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