American Museum of Natural History
Author
Series
Language
English
Description
A history of man's search for substitutes for muscle power. Describes such sources of energy as sun, wind, water, fossil fuels, and the atom; and examines the devices which convert these into usable power: windmills, steam engines, turbines, nuclear reactors, and others.
3) Conservation
Author
Series
Language
English
Description
Discusses the meaning of conservation, the difficulties of saving wildlife threatened with extinction, and the purpose and operation of zoos, nature reserves, and national parks.