Letters from Egypt, Ethiopia, and the Peninsula of Sinai. With Extracts from His Chronology of the Egyptians, with Reference to the Exodus of the Israelites. Revised by the Author.

Elibron Classics. Digitized replica of 1853 edition by Henry G. Bohn, London.
This is an illustrated edition. Oversize maps are available as a free download.
This is the account of expeditions to Egypt, Sudan, Ethiophia and the Sinai to explore and record the remains of the ancient Egyptian civilization. Among other things Lepsius discovered over sixty-seven pyramids and more than 130 tombs of noblemen in the area.