hydroelectricity
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No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)

Transmission line towers and high tension lines that carry current generated at TVA's Wilson Dam hydroelectric plant, near Sheffield, Ala. (LOC)
by The Library of Congress
by The Library of Congress
No known copyright restrictions(著作権制限なし)

Section of one of the switchyards from which high tension lines carry current generated at TVA's Wilson Dam hydroelectric plant, Sheffield vicinity, Ala. Located 260 miles above the mouth of the Tennessee River, the dam has an authorized power installatio
by The Library of Congress
by The Library of Congress
No known copyright restrictions(著作権制限なし)

This husky member of a construction crew building a new 33,000-volt electric power line into Fort Knox is performing an important war service. Thousands of soldiers are in training there, and the new line from a hydroelectric plant at Louisville is needed
by The Library of Congress
by The Library of Congress
No known copyright restrictions(著作権制限なし)
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