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One of the reasons why many publishing houses hesitate when allocating resources to the development of more advanced concepts of school dictionaries for first-language learners is the relatively poor sales and corresponding profits coming from this catego... see more

One of the reasons why many publishing houses hesitate when allocating resources to the development of more advanced concepts of school dictionaries for first-language learners is the relatively poor sales and corresponding profits coming from this catego... see more


Biogas production considered the most encouraging sources of renewable energy in Sudan. Anaerobic process of digestion is considered as efficient techniques of producing biogas. The process also a trustworthy method for treatment of municipal wastes, and ... see more

1 of 1.280 pages  |  10  records  |  more records»