Hardcover copyright 1997 HOUGHTON MIFFLIN grade 4 IMAGINE student textbook. This book is from the Houghton Mifflin INVITATIONS TO LITERARCY Reading Program. The themes in this book (1) It's Cool. It's School., (2) Earth Preserve and Protect, (3) Super Sleuths, (4) American Snapshots, (5) Meet The Challenge, and (6) Could It Really Happen?.