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Nazi German secret underground oil refinery codename Dachs 1 inside Jakobsberg in Porta Westfalica, North Rhine Westphalia, Germany. May 10th 2015. Si Stock Photo - Alamy
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Nazi German secret underground oil refinery codename Dachs 1 inside Jakobsberg in Porta Westfalica, North Rhine Westphalia, Germany. May 10th 2015. Si Stock Photo - Alamy
shale oil | petroleum | Britannica
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