ROBERT CROWTHER´S AMAZING POP-UP BIG MACHINES - Walker

Play with five amazing machines in this spectacular, young pop-up book. Load and tip a dumper truck, or plough a field with the tractor. Find out why giant cranes don't fall over and work out how bulldozers flatten roads. From farms and factories to quarries and building sites, big machines are everywhere. Here are 28 of the most amazing.