Book excerpt: An expanded and revised edition of the famous book of portraits of prostitutes in turn-of-the-century New Orleans, the inspiration for the Louis Malle film Pretty Baby. This new edition includes 52 tritone photos printed in a large format. The text from the original edition--by John Szarjowski, former director of photography at the Museum of Modern Art--is reprinted here, along with a new Introduction by Susan Sontag.