1996 - Tag Against Time (Paperback) → Hardcover ISBN-13: 9781571400079 ISBN-10: 1571400079 Genres: Children's Books, Teen & Young Adult, Nonfiction, Engineering & Transportation ? 1993 - Walker of Time (Paperback) → Hardcover ISBN-13: 9780943173801 ISBN-10: 0943173809 Genres: Children's Books, Teen & Young Adult 1 |