Amazon is fairly quick to pull down books that violate copyright. Since the book has been out there for quite a while, either the company in question does own the copyright, or the copyright holder hasn't noticed it available on Amazon. Given how famous the books are, I find the later hard to believe. My basic take on it is that as long as you purchase it in good faith, from a well known ebook store with a good reputation such as Amazon, you should be ok. It is almost impossible to determine via an online search who legally has the ebook rights to a given book.
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