1. A check list of African mammals;Allen G. M.;Bull. Mus. comp. Zool. Marv,1939
2. Late Quaternary Niger delta and adjacent areas: sedimentary environments and lithofacies;Allen J. R. L.;Bull. Am. Ass. Petrol. Geol,1965
3. Palynology of Mauritanie;Assemien M. P.;Bull. Assoc. sénég. Étude Quatern. ouest Afr,1967
4. The significance of valleys as avian zoogeographical barriers;Benson C. W.;Ann. Cape Prov. Mus,1962