"A kindergarten-level introduction to dump trucks, covering their size, movement, role in the process of construction, and such defining features as their beds and large wheels"--
"A kindergarten-level introduction to bulldozers, covering their size, movement, role in the process of construction, and such defining features as their crawler tracks and blades"--
"A kindergarten-level introduction to diggers, covering their size, movement, role in the process of construction, and such defining features as their arms and buckets"--
"A kindergarten-level introduction to cranes, covering their size, movement, role in the process of construction, and such defining features as their arms and cables"--