סרטים: United States Bureau Of Mines
- 1923
The Story of Petroleum
The Story of Petroleum6.71923HD
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![The Story of Petroleum]()
- 1951
A Story of Copper
A Story of Copper01951HD
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![A Story of Copper]()
- 1950
The Magic of Sulphur
The Magic of Sulphur01950HD
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![The Magic of Sulphur]()
6.71923HD
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01951HD
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01950HD
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