Sara Gilbert

A basic introduction to the features and functions of drilling machines, examining the forms they have taken from ancient times to today.

This book describes diggers, including their parts, tools, and construction work.

"An introduction to the life and era of the fearsome, carnivorous dinosaur known as Tyrannosaurus rex, starting with the creature's 1902 discovery and ending with present-day research topics"--Provided by publisher.

"An introduction to the life and era of the horned, herbivorous dinosaur known as Triceratops, starting with the creature's 1888 discovery and ending with present- day research topics"--Provided by publisher.

"A look at the origins, leaders, growth, and management of the NFL, the professional football league that was formed in 1920 and today governs 32 teams throughout the United States"--Provided by publisher.

An elementary exploration of earthquakes, focusing on the geological evidence that helps explain how and where they form and spotlighting famous examples, such as the 2004 Indian Ocean quake.

An elementary exploration of canyons, focusing on the geological evidence that helps explain how and where they form and spotlighting famous examples, such as Arizona s Grand Canyon.

An elementary exploration of glaciers, focusing on the geological evidence that helps explain how and where they form and spotlighting famous examples, such as those in Glacier National Park.