Good reads doesn't list the 2013 ebook edition of this book, so I'm linking to this. The 2013 edition has a new introduciton by [a:Larry Niven|12534|Larry Niven|https://images.gr-assets.com/authors/1596428206p2/12534.jpg], so it's adifferent book, not a different edition of the same book! Granted, it doesn't have an ISBN or even a copyright page, so how woudl the librarians add an entry for it?

Anyway, I read it again.