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It was an atlas and a common one. There are thousands of little islands in Japan you won't find detailed maps of them all in books, plus Rokkenjima is a private island and that's of no public interest. If Eva was going to look for a map of Rokkenjima she would rather find it in a single document not inside a book.
Also this riddle is meant to be solvable by the readers and Ryukishi said that someone already solved 99% of it. It is most definitely a place you can see in a common map.
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