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Before there was an Internet, books had a couple of pages at the back of the book. One would be an order form for more books by the same author, and the other would be an order form for similar books by different authors. We tore out the pages and mailed them in with paper checks, and in 3 or 4 weeks, the books arrived.
It was a way to find new writers and books. That would certainly be user friendly advertising to put in ebooks, IMO.
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