Silver Mines
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It was called the "mother lode", a deposit of silver so massive that it would produce $300-million in its first 25 years of operation, establish Nevada as a state, and bankroll the Union Army in the Civil War. Named after an early investor, we'll see how the Comstock Lode, discovered near Virginia City, proved to be a scientific laboratory from which vast improvements in mining technology and safety were pioneered, including innovations in drilling, ventilation, drainage, and ore processing.
S03E01
44 分
Space Shuttle
20 8月 1995
S03E02
44 分
Brooklyn Bridge
1 10月 1995
S03E03
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Tunnels
8 10月 1995
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Tennessee Valley Authority
15 10月 1995
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Oil
16 10月 1995
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Silver Mines
1 10月 1995
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44 分
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