This hardcover book titled "Silver Age Sentinels: d20 Edition" is a must-have for young adults who are fans of games and activities, comics, and graphic novels. Written by Mark C. Mackinnon, this book is published by Guardians of Order and has a total of 336 pages. It measures 11 inches in length and 8.5 inches in width, with a weight of 44.8 ounces. The book is intended to be a role-playing and fantasy guide, with a focus on the Silver Age Sentinels. It is written in English and was published in 2002. This book is perfect for those who are looking for a comprehensive guide on the Silver Age Sentinels and their universe.