1. Returns to farm-level soil conservation on tropical steep slopes
: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]