Quote:
Originally Posted by Ralph Sir Edward
History textbooks, maybe. Most static subject wouldn't get revised, so the copyright renewal would be OK.
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History textbooks get horribly out of date, because they're written to confirm the prejudices of their eras. However, as historical books in their own right, they're often worth studying--and sometimes, the authors and publishers wish the older editions would just vanish, because they don't want anyone to know they used to promote those ideas.