"Lost memories" book was released as an addition to the official Konami Silent Hill 3 Game Guide in 2003. It was printed in the second part of the guide turned upside down - the back cover of the guide is the front cover for "Lost Memories". In "Lost Memories" you can find a lot of info about the first three Silent Hill installments: characters and creatures descriptions, creators commentaries, making history, inspirational works and so on. Unfortunately the guide was released only in Japanese, but thanks to the fans efforts the guide was translated into other languages.

Wall of Death's site with almost complete translation of "Lost Memories":
Silent Hill Chronicle

Scans of the book with English translation:
Translated Memories

Downloadable html variant of the book with pictures:
English - 4.1 mb