In The Dinosaur's Paw Author:Patricia Reilly Giff The Kids of the Polk Street School series. Book #5. It's the first day back to school after winder vacation, and Richard Best is off to a bad start. Who ever heard of a January without any snow? And as usual, he has already forgotten something - the ruler Ms. Rooney had told him to bring for dinosaur day. Luckily Richard finds a ruler in his des... more »k - with a dinosaur's initials - and he's sure the ruler is special. And then he finds out it has magic powers!« less