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I'd be interested in seeing a table of contents, to take a brief look at seeing how much of the textbook is public domain. There isn't enough data to quite be able to tell from the post; an English class could cover mostly PD classics, or mostly 20th century stuff (which I expect to fall into the public domain about the time we just give up on copyright... your guess is as good as mine as to when that is), or anything in between.

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