Note 8 — Chapter V · The Oases and the Geology of the Nile valley, by Mr. H. J. L. Beadnell, F. G. S., F. R. G. S.
Reading edition
In writing this note at the request of Sir William Willcocks I have made free use of all sources, of information, but am chiefly indebted to the publications of Schweinfurth and the late Professor Zittel, Capt. Lyons, and my past and present colleagues on the Geological Survey of Egypt.