The desert swallowed Tebtunis in the twelfth century A.D., so the town does not appear on any maps. We know its name, and a great deal more, from the tens of thousands of papyrus fragments found throughout the twentieth century by a succession of archaeologists, including those working at the site today. These records, which range from pieces found in ancient garbage dumps, to sheets recycled as wrappings for mummies, to five-yard-long scrolls, include literary texts and records of private contracts and public acts. "The papyri give us particular and historic information that cannot be found elsewhere," says Claudio Gallazzi,...