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Library of Congress
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{ ?s ?p Introduces various sources of energy that have been used from the time of the cavemen to the present.. }
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75036587
abstract
"
Introduces various sources of energy that have been used from the time of the cavemen to the present.
"
.
75036587
description
"
Introduces various sources of energy that have been used from the time of the cavemen to the present.
"
.