Student World Atlas (Maailma atlas)
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SOurce' M inerals Yearbook. U S, Geolo gic al Survey:
Inte rnatio nal Energy Annual.
U.S Energy Infor mation Adrrin,sv ation
Leadin g Petroleum Producing States, 1999 Leading Natural Gas Producing States, 1999 Leading Coal Producing States, 2000
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