Dark Horse's English edition of the 25th anniversary book: the official timeline, the artwork and the Himekawa Skyward Sword manga, carried over from Shogakukan's 2011 Japanese original.
The cover, though, is American work. Where Japan printed a plain brown field with a small gold crest, Dark Horse went deep green with the Gate of Time emblem from Skyward Sword. Same book inside, two completely different faces, which is why collectors hunt both.