//-->
Livestock and sustainable nutrient cycling in mixed farming systems of sub-Saharan Africa : proceedings of an international conference, Addis Ababa, Ethiopia, 22 - 26 November 1993
Powell, Joseph M., (1994)
Technical papers. - 1995. - VII, 560 S. : graph. Darst.
Trypanotolerant livestock in West and Central Africa
(1980)