Inside Big Dig from Silver Dolphin Books, you can get up close and personal with the tough and exciting world of construction vehicles. Pull the tabs, lift the flaps and slide the panels to find out such things as how a bulldozer works, how a crane reaches up high and how concrete is mixed. Reusable stickers take the fun further as kids use them to decorate the different machines and create their own scenes. (This product is no longer in print.)