Terra Dankowski writes: “Nearly 150 years after it leveled 18,000 buildings and killed 300 people, the Great Chicago Fire (October 8–10, 1871) lives on—in the city’s tourist attractions, sports team names, and soon in a Chicago History Museum exhibit commemorating its anniversary this fall. ‘It’s just amazing how much the aftermath was documented,’ says Ellen Keith, director of the museum library. The library’s holdings include period maps and stereographs (an early form of three-dimensional photographs popular in the 19th century) depicting the burned areas of the city, transcripts of the 1871 fire department hearings, a 1997 mayoral resolution exonerating Mrs. O’Leary and her cow of blame for setting the blaze, and even sheet music for songs about the fire.”