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For iOS certainly. I will admit there are a couple of books on the list I have that aren't returning data, so I need to check what they are. My guess is that at some point they have been published / removed, which would cause their id to become invalid, and that is what we use to work things out. I think it's only two books though
One thing to note, some of those books will be the Canadian or US versions, so when you click on the URLs you may find it states the book isn't available in your region (UK). It is possible they may also be the world-wide versions, I've not expressly checked that though.
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