Mortality rates between 1925 and 1927 on the Niger. [fact]
Mortality rates between 1925 and 1927 on the Niger Valley dams were be- tween 6 percent and 13 percent.
Alice L. Conklin, A Mission to Civilize_ The …, loc. 1432Mortality rates between 1925 and 1927 on the Niger Valley dams were be- tween 6 percent and 13 percent.
Alice L. Conklin, A Mission to Civilize_ The …, loc. 1432