Gregory, John Walter, 1864- <br/><br/>
The rift valleys and geology of East Africa  an account of the origin & history of the rift valleys of ... 
by J. W. Gregory 
 - Service & Co. Limited, London  Seeley  1921 
 - 479 p. : ill. ; 22 cm. 
<br/><br/>p. 423-453. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Africa, British East<br/>Geology--Africa, East<br/>Physical geography--Africa, British East