Book excerpt: Rough 'n' Tough Big Wheels takes kids up close to the tough and exciting world of big machines. This boldly illustrated interactive book shows how a tractor and a big rig work, what each fire truck compartment stores, and how a dump truck dumps its load. With interactive flaps, tire tread foam on the front cover, and stickers to add to each page, Big Wheels helps kids learn to identify all the various parts and gadgets associated with four popular vehicles.