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https://en.wikipedia.org/wiki/Value_(economics)
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Friday, July 22, 2011 Energy in the Industrial Revolution http://earlywarn.blogspot.ru/2011/07/energy-in-industrial-revolution.html
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Friday, July 22, 2011 Energy in the Industrial Revolution http://earlywarn.blogspot.ru/2011/07/energy-in-industrial-revolution.html
