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Describes mountains, the plants and animals that live on them, and the many pleasures they offer.

A reference book dealing with people and their customs all around the world. Includes such aspects as homes, education, food, clothes, and religion.

A reference book dealing with the many ways people earn a living.

A reference book dealing with the small craft of rivers and canals and the large sailing ships, steamships, warships, and cargo and passenger ships.

A reference book dealing with balloons, gliders, and all manner of aircraft, with special sections on flying animals and on airports.

A reference book dealing with the workings of the human body, with special sections on the brain and senses, health, and reproduction.

A reference book dealing with the earth, its atmosphere and weather, geology, volcanoes, earthquakes, mountains, lakes, and other geographical features.

A reference book dealing with the solar system, the universe, astronomy, and space travel.

A reference book dealing with the solar system, the universe, astronomy, and space travel.