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15 years ago
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Transcript -- Longterm sustainability of quarries
Earth's physical resources: rocks for roads - for iPod/iPhone
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Transcript -- Longterm sustainability of quarries
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Rocks for Roads
Rocks for Roads...
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15 years ago
00:56
Transcript -- Rocks for Roads
Transcript -- Rocks for Roads...
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15 years ago
00:00
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How a quarry works...
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15 years ago
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Transcript -- How a quarry works
Transcript -- How a quarry works...
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15 years ago
00:00
Longterm sustainability of quarries
Longterm sustainability of quarries...
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