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Originally Posted by Abecedary
I'm not so sure it's too relevant. I mean, would you want to learn from a physics, chemistry, or business textbook that was published in the 1920s? Sure, you could get a semi-decent basic education from those, but nearly any field with a textbook that gets updated regularly is moving a whole lot faster than that.
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History textbooks, maybe. Most static subject wouldn't get revised, so the copyright renewal would be OK.