Sökt på: Böcker av Richard Hantula
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Pennsylvania
This book traces the history, geography, economy, and people of the state of Pennsylvania, with information on important dates and events, plants and animals of the region, and the …
Science at Work in Baseball
Science at Work in Soccer
Solar Power
Along with geothermal energy, solar energy is now one of the least environmentally disruptive sources of power by which electricity is generated today. Sunlight is a free, …
How Do Hybrid Cars Work?
In recent years, there has been much concern about the world's reliance on nonrenewable resources, such as oil. Scientists are attempting to decrease our dependency on oil - …
Pennsylvania
This book explores the geography, climate, history, people, government, and economy of Pennsylvania. Readers can use this as the definitive research tool for the facts on the …
Pennsylvania (ARC Edition): The Keystone State
Science at Work in Football
Pennsylvania
Nicknamed the Keystone State for the pivotal role it played in colonial days, Pennsylvania has transformed itself from an industrial hub whose strength rested on coal mining and …