PreS. There can never be enough truck books for some preschoolers, and those who feel that way are sure to love this one--for the sound and rhythm of the words as well as clear, brightly colored pictures of machines in action. As a boy and his mom watch the activity at a building site, the child hears the pounding of the huge machines. Digger goes "Grrr-clank! Grr-clank! Grrr-clank-clank!"; "Flatbed backs and grunts, then backs and grunts some more"; Cement Mixer rumbles and grumbles. The workmen are Digger's helpers, and the pictures show them climbing and clanging, welding and hammering. When all the work is done, there is a new community center for everyone. After a read-aloud, toddlers will want to play out the construction action again and again.