Assertion: natural gas's amount | /r/HasProperty | postulated by geologist wallace pratt
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text: In 1956, Hubbert used an estimated ultimate recovery (EUR) of 850 trillion cubic feet (24,000 km3) (an amount postulated by geologist Wallace Pratt) to predict a US production peak of about 14 trillion cubic feet (400 km3) per year to occur "approximately 1970".