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{{copyright|Levorsen, 1954; courtesy W.H. Freeman and Co}} Modified. Copyright: Levorsen, 1954; courtesy W.H. Freeman and Co. Category:Predicting the occurrence of oil and gas traps
{{copyright|Levorsen, 1954; courtesy W.H. Freeman and Co}}

Modified. Copyright: Levorsen, 1954; courtesy W.H. Freeman and Co.

[[Category:Predicting the occurrence of oil and gas traps]]

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