Gibson, William, 1948- The difference engine / William Gibson and Bruce Sterling. - 20th Anniversary edition, Spectra trade paperback edition. - New York : Spectra, 2011. - xi, 492 pages : map ; 21 cm ISBN: 9780440423621 (pbk.) LCCN: 2012372601 Subjects--Personal Names: Babbage, Charles, 1791-1871 --Fiction.Oliphant, Laurence, 1829-1888 --Fiction. Subjects--Topical Terms: Computer engineering--Fiction. Index Terms--Genre/Form: Steampunk fiction. LC Class. No.: PS3557.I2264 / D54 2011 Dewey Class. No.: 813.54