From "A handbook for travellers in lower and upper Egypt : including descriptions of the course of the Nile through Egypt and Nubia, Alexandria, Cairo, the pyramids, Thebes, the Suez Canal, the peninsula of Mount Sinai, the Oases, the fayoom &c.": 112
"1949 reprint by the Société royale d'études historiques of six hydrographic maps created and first published during the 1850s and 1860s by the Dépôt de la guerre. The American University in Cairo is in possession of five of the six maps."