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	1.	No cover image available Brent coal typing by combined optical and geochemical studies by Ducazeaux, Josette Tran, Khanh le Nicolas, Gilles Material type: Article; Format: print Language: Eng In: Bulletin des centres de recherches exploration-production Elf Aquitaine 15(2), 1991, p. 369-381: : ill., graph. Availability: No items available.
	2.	No cover image available Utilisation des hydrocarbures gazeux en prospection régionale des minéralisations plombo-zincifères de couverture : application au gîte de Trèves (Gard, France) by Disnar, Jean-Albert Gauthier, Bernard Carter, Jonathan Material type: Article; Format: print Language: Fre In: Chronique de la recherche minière 482, 1986, p. 67-75: : carte, tab., rés.(Fr., Angl) Availability: No items available.
	3.	No cover image available Abiogenic hydrocarbons and mantle helium in oil and gas fields by Jenden, Peter Hilton, David Kaplan, Isaac Craig, Harmon Series: U. S. Geological Survey Professional paper, 1570 Material type: Article; Format: print ; Literary form: Not fiction Language: Eng In: The future of energy gases p. 31-56 : graph., tab. Availability: No items available.

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