Describes each part of a helicopter, shows how they are used in battle, transport, rescue work, and medical emergencies, and briefly traces the helicopter's history
Briefly traces the history of the space shuttle program, explains how each part of the shuttle works, and describes the kinds of work done on a typical mission
Examines a wide variety of marsupials, such as kangaroos, opossums, and wombats, and describes their physical characteristics, habits, natural environment, and evolution
Examines a wide variety of marsupials, such as kangaroos, opossums, and wombats, and describes their physical characteristics, habits, natural environment, and evolution.