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History
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in 2006
in 2006
in 2008
in 2008
Reclaimed strip mines in southwestern Pennsylvania
Reclaimed strip mines in southwestern Pennsylvania
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Mining of sulfur from a deposit at the edge of Ijen's crater lake, Indonesia.
Mining of sulfur from a deposit at the edge of Ijen's crater lake, Indonesia.
Malachite
Malachite
Agricola, author of De Re Metallica
Agricola, author of De Re Metallica
Gallery, 12th to 13th century, Germany
Gallery, 12th to 13th century, Germany