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If they have the same ISBN, no you cannot post as Lisa said. But if they have different ISBNs - say, one is a hardback and one is a paperback, then you can post them both. I have been in both situations myself. For the first, when I tried (in my ignorance at the time) to post the second book, the system caught it and denied me access util book #1 was requested. In the second case,, I posted them both without problems and they were requested by two different people.