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	1.	No cover image available Utilización de mini dragas HG de succión, una solución rentable para la minería aurífera artesanal Material type: Article; Format: print Language: Spa In: De re metallica. De la minería y los metales: revista del Instituto geológico metalúrgico 23-25, 1988, p. 7-9 : tab. Availability: No items available.
	2.	No cover image available Overview of the U : S Departement of energy/Morgantown energy technology Center natural gas program by Layne, Abbie 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. 685-689 : graph. Availability: No items available.
	3.	No cover image available WATERLINES by Intermediate Technology Publications Publication details: Angleterre, London : Intermediate Technology Publications, [19--] Availability: Items available for loan: Biblioteca IFEA (9). Place hold

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