Three volumes: Gravity's Rainbow (1973), Gravity's Rainbow Companion by Steven Weisenburger (1988) and Gravity's Rainbow Illustrated by Zak Smith (2006), the primary text, companion and illustrated version. Has any novel published since World War Two produced a similar offspring? Enough has been said or written about Gravity's Rainbow; the Companion, 15 years later, works its way through the book, cross referenced to the Viking edition here, translating, explaining references, clarifying locations, dates and times, characters and events; the illustrated version, 18 years later, runs to 760pp., ie one illustration for each page of Gravity's Rainbow. Viking objected to the title of the illustrated version. Copies were recalled and it was reissued as Pictures Showing What Happens on Each Page of Thomas Pynchon's Gravity Rainbow. The copy here is the first issue signed by Zak Smith and Steve Erickson, who wrote the introduction. The primary text and its two very different companions of a 20th century fictional encyclopedia.