Apatosaurus was one of the largest animals to ever live on land. This dinosaur had a neck more than 17 feet (5 meters) long. It used its long neck to eat leaves from tree branches. Learn more about this remarkable reptile in Apatosaurus, a Mighty Dinosaurs book.

Learn facts about pterodactyls.

Stegosaurus lived in grasslands near lakes and rivers. It is best known for having the smallest brain compared to its body size of all dinosaurs. Learn more about this remarkable reptile in Stegosaurus, a Mighty Dinosaurs book.

Spinosaurus was possibly the largest predatory dinosaur that ever lived, surpassing the better-known Tyrannosaurus rex in size. The long bones sticking out of its back looked like a giant sail. Learn more about this remarkable reptile in Spinosaurus, a Mighty Dinosaurs book.

Tractors use tools to do different jobs. A backhoe loader is a special kind of tractor with a bucket on the front and a scoop on the back. Learn more about these machines in Tractors, part of the Monster Machines series.

The Pledge of Allegiance was created as a show of patriotism. Written 27 years after the end of the Civil War, it quickly became a symbol of national unity. Find out more in Pledge of Allegiance, one of the titles in the Icons of America series

El Hall de la Independencia fue la primera casa de gobierno para el Estado de Pensilvania y se ha convertido en un importante símbolo de los Estados Unidos. Descubre más en El Hall de la Independencia, uno de los títulos de la serie Íconos Americanos.

There are many types of skiing. In some events, skiers race down mountainsides at top speeds. In others, they fly off ramps and perform tricks" -- Cover verso.

Using simple text and colorful photos, this book describes the sport of BMX, or bicycle motocross. It includes basic information on safety, equipment, and competitive events.

Did you know that earthquakes can break apart the ground? People can feel the ground moving underneath them during an earthquake. Learn more about earthquakes in How Earthquakes Shape the Earth, a Shaping Our Earth book.