This is the Construction Zone board book, otherwise known to Ben as the "'MENT TRUCK BOOK!" That's "cement truck book." We daren't correct him that it's a concrete truck. He says tank truck, cement truck, dump truck, and so on.
Glenn Fleishman writes words about things
turning tech mumbo-jumbo into tasty, readable gumbo
Taking mumbo jumbo and turning it into tasty technology gumbo