An African fertilizer crisis
Tài liệu tham khảo
Food and Agriculture Organization, 1986, Atlas of African Agriculture, 67
Government of the Gambia, 1986, Fertilizer Sub-Sector Paper: Marketing and Price Policy Analysis, 13
Government of the Gambia, 1986, Fertilizer Sub-Sector Paper: Marketing and Price Policy Analysis, 28
Government of the Gambia, 1986, Fertilizer Sub-Sector Paper: Marketing and Price Policy Analysis, 63
Matlon, 1987, The West African semi-arid tropics, 73
1987, 360