1. Cf.The Population of Tropical AfricaCaldwell J. C. Okonjo C. London1968 6 6 (Eds.)
2. Caldwell, J. C. and Okonjo, C., eds. 1968.The Population of Tropical Africa71–122. London (Eds.)
3. Caldwell, J. C. and Okonjo, C., eds. 1968.The Population of Tropical Africa71–122. London (Eds.)