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	Biogas Digest Volume I: Biogas Basics  manuel - 1999 - 46 pp Ed. GIZ - Eschborn
	Biogas digest Volume II, Biogas - Application and product development  manuel - 1998 - 81 pp Ed. GIZ - Eschborn
	Biogas Digest Volume III Biogas - Costs and Benefits and Biogas – Programme Implementation  rapport - 1999 - 61 pp Ed. GIZ - Eschborn

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