"Ruedas Literatura juvenil." . . "Roues Ouvrages pour la jeunesse." . . "JUVENILE NONFICTION Science & Nature General (see also headings under Animals or Technology)" . . . . . . . "Describes how wheels help people as well as how wheels work. Includes an experiment at the end." . . . . . . . . "Electronic books" . "Llantas y rayos un libro sobre ruedas y ejes" . "Llantas y rayos : un libro sobre ruedas y ejes" . . "Juvenile works" . . . . .