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- ARAYA, Bereket - ASAFU-ADJAYE, John. Returns to farm-level soil conservation on tropical steep slopes : the case of the eritrean highlands. Brisbane : The University of Queensland, 1999. 24 s. Discussion paper, No. 253. ISSN 1033-4661. [Copy count : 1, currently available 1, at library only 0]
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- ASAFU-ADJAYE, John. An Empirical test of the environmental transition hypothesis. Brisbane : The University of Queensland, 1997. 24 s. Discussion papers, no. 212. ISSN 1033-4661. [Copy count : 1, currently available 1, at library only 0]
book