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But to be processed for search, it has to be more than just a collection of pictures of pages, as some are. The Air Force History web site's books are like this.
PDF is displayed by almost everything, but they are not sold by the big booksellers. They also need to be published to a smaller size paper to appear reasonably readable on smaller devices.
Being able to be read on everything occupies Hitch's attention full time and overtime, as an e book maker.
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