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Most TLs if their PoD is back far enough and they are in the region make a point of saving the local Ancient Library institutions which had a disturbing habit of burning throughout history. Or if there isn't one handy establishing one.
The general feeling seems to be that with these collections intact civilisations will have better chances at progressing in areas like philosophy, technology, law, medicine, systems of government/ and so on.
But is that actually true?
Do we have any hint that having a library around really proved a benefit to progress or at least that the loss of library proved a disadvantage?