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I've published both of my books so far (one of them a collection probably somewhat similar to yours) through CreateSpace, and they've been great for me. They don't publish as an app, obviously, but an ebook version gets listed on the kindle store, which is pretty sweet. For an entire app you'd probably have to do it from scratch, which I have no experience with whatsoever. Personally, I don't see the appeal to doing it that way, but it's up to you.