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19 bytes added ,  15:40, March 15, 2009
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====notes====
 
====notes====
 
<references/>
 
<references/>
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[[Category:Mining]]
 
[[Category:Economic history]]
 
[[Category:Economic history]]
 
[[Category:Business]]
 
[[Category:Business]]
 
[[Category:Energy]]
 
[[Category:Energy]]
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