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![Cover for Mahmoud M El-halwagi · Biogas Technology, Transfer and Diffusion (Paperback Book) [Softcover reprint of the original 1st ed. 1986 edition] (2014)](https://imusic.b-cdn.net/images/item/original/161/9789401084161.jpg?mahmoud-m-el-halwagi-2014-biogas-technology-transfer-and-diffusion-paperback-book&class=scaled&v=1612101285)