Tonka Super Concrete Mixer Author:Lori Froeb The Tonka concrete mixer is on the move. Come take a ride and see all the places concrete is used! Check out the plant where the mixer picks up its load of dry concrete mix, see how an in-ground pool is poured, and discover other ways that concrete is used. Put on your hard hat and let's go! — Board book with sand that pours down a pipe inside th... more »e cover.« less