Campbell First Explorers Series: MachinesDescription Discover machines on the building site, at home and in the playground in First Explorers: Machines. Each scene has chunky push, pull and slide mechanisms perfect for little hands. Spot diggers, tractors and cranes, as well as lots of other machines at work, and read the fun facts. Beautifully illustrated by Jenny Wren, this title provides gentle early learning and is a simple introduction to science topics for small children. An