Gregory (J.W.)
The Rift Valleys and Geology of East Africa;
With Appendices on the Edible Earths, Soils, Fossils, Rocks, & Masai Place-Names by Prof. E.P. Cathcart, F.R.S., Prof. R.A. Berry, R.B. Newton Esq., Miss Agnes Neilson, & A.C. Holles Esq., C.M.G.