M. King Hubbert: Nuclear Energy and the Fossil Fuels. (PDF) In: Drilling and Production Practise. American Petroleum Institute, 7. März 1956, S. 40, archiviert vom Original am 27. Mai 2008; abgerufen am 17. November 2018 (englisch): „If we suppose the figrue of 150 billion barrels to be 50 billion barrels to low - an amount equal to eight East Texas oil fields - then the ultimate potential reserve would be 200 billion barrels. The second of the two extrapolations shown in Figure 21 is based upon this assumption; but it is interesting to note that even then the date of culmination is retarded only until about 1970. (S. 24)“
M. King Hubbert: Nuclear Energy and the Fossil Fuels. (PDF) In: Drilling and Production Practise. American Petroleum Institute, 7. März 1956, S. 40, archiviert vom Original am 27. Mai 2008; abgerufen am 17. November 2018 (englisch): „If we suppose the figrue of 150 billion barrels to be 50 billion barrels to low - an amount equal to eight East Texas oil fields - then the ultimate potential reserve would be 200 billion barrels. The second of the two extrapolations shown in Figure 21 is based upon this assumption; but it is interesting to note that even then the date of culmination is retarded only until about 1970. (S. 24)“