"America" . . . . "North America" . . "North America." . "South America" . . "South America." . . "North & South America : New World continents & land bridges" . "New world continents and land bridges : North and South America" . "North & South America : new world continents & land bridges" . . . "The Americas -- Introducing North America -- North America: landforms -- North America: climate, plants and animals -- North America: history and culture -- Introducing South America -- South America: landforms -- South America: climate, plants and animals -- South America: history and culture -- Continental connections and plate tectonics -- Land bridges: the narrow link -- Land bridges: dropping seas." . . "North & South America" . . . . . . . . . "Juvenile works" . . . . "North and South America : new world continents and land bridges" . .