This book's ISBN is not in any database I have searched, perhaps because it is a Scholastic edition distributed only through schools. However, except for the binding, it appears to be identical to the hardcover version, ISBN 0517883368.
Copyright 1992, 36 pages. From the back cover:
Imagine discovering a beast that stood 15-feet high and 40-feet long! In the fall of 1988, a Montana rancher happened upon the first arm bone of Tyrannosaurus rex ever found. Buried with it in the Montana sandstone was the most complete tyrannosaur skeleton yet discovered.
Jack Horner describes how he and his team worked together to excavate this unique fossil. Find our what their discoveries revealed about the life and appearance of the best-known and most fearsome of the dinosaurs.
"With both excitement and deliberate care, a paleontologist and a science journalist describe the discovery and excavation of the first complete Tyrannosaurus rex skeleton ever found. The book has a bright and clear design with double-page spreads and lots of color photographs, diagrams, and boxed insets to encourage browsers. Of course, dinophiles will pore over every detail." -- Booklist