Buffy Silverman 
How Do Tanks Work? [PDF ebook] 

Tanks are tough and powerful. They can travel across all types of land. But how do these heavy vehicles keep their tracks moving? And how many people does it take to drive a tank? Fans of tanks will love this exciting, accessible look at tanks, including how they work, the special equipment they need, and what makes them the toughest all-terrain vehicles on the planet. From the armor to the turret to the churning treads, this book covers the details that will draw in young readers.