. . . . "Alphabet books" . . "ABC of ecology. Photographs and design by Donald Crews"@en . . . "Ouvrages pour la jeunesse" . . . . . . . . . "Juvenile works" . . "Each letter of the alphabet introduces a cause of pollution and a way of preventing it." . . . . . "ABC of ecology" . "Milieuverontreiniging." . .