A New true book

Discusses the benefits of air, and looks at the harmful effects and methods of preventing air pollution.

Describes some of the bad changes man is inflicting on the world, such as the cutting down of tropical forests, the destroying of ozone, oil spills, and acid rain.

Explains how people have disrupted ecological chains, and what should be done to protect Earth's natural resources.

Describes the planet Mercury and humanity's search for knowledge about its nature.

Describes briefly all aspects of baseball including the object of the game, the field, the equipment, positions, plays, teams, leagues, famous players, and games.

An introduction to the rules, techniques, and strategies of soccer with information on leagues and different types of soccer.

An introduction to each part of the skeletal system and of the skin, using photographs and drawings to depict details.

Briefly traces the history of the modern Olympic Games as they developed from a single 200-meter race run in Olympia, Greece, in 776 B.C.

Briefly discusses the history and uses of automatically operating devices from mechanical toys through dishwashers and clock radios to cyborgs and manipulators.

Describes man's first landing on the moon, later moon walks in Project Apollo, and the importance of these missions to our exploration of space.