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Cranes, Dump Trucks, Bulldozers : and Other Building Machines (How Things Work)
Cranes Dump Trucks Bulldozers and Other Building Machines - How Things Work Author:Terry Jennings Here's a lively look at large building machines. It discusses how roads are made, shows how levers and pulleys help us move heavy loads, explains what a cement mixer has to do with Archimedes, and much more.