9781429663502 | Pap/psc edition (Capstone Pr Inc, January 1, 2011), cover price $8.10

9780981974583 | Aloha Pub Llc, October 16, 2010, cover price $15.95 | About this edition: Bob the Booger - A story that is an extremely funny representation of what people do with what comes out of their noses and how they dispose of it.

9780374231767, titled "A Philosophical Investigation" | Farrar Straus & Giroux, April 1, 1993, cover price $20.00 | About this edition: In an intensely violent futuristic world where serial killers abound and people are screened to determine their predisposition for criminality, a man who fits the model decides to become a serial killer of serial killers

9780143117537, titled "A Philosophical Investigation" | Reprint edition (Putnam Pub Group, April 27, 2010), cover price $16.00

9780770425920, titled "A Philosophical Investigation" | Doubleday of Canada, February 1, 1995, cover price $8.99

9780385254564 | Bantam Books of Canada Ltd, March 1, 1994, cover price $12.95 | also contains Kitanai and Filthy Flamingo Wash Up

9780452271401, titled "A Philosophical Investigation" | Reprint edition (Plume, March 1, 1994), cover price $14.00

9781429639583 | Fact Finders, January 1, 2010, cover price $26.65 | About this edition: From leftover trenchers and stinky chamber pots to barber surgeons and the black plague, life could be really miserable for people during medieval times.

9781607544104 | Board book edition (Rosen Pub Group, July 1, 2009), cover price $11.40

9781931636582 | Reprint edition (Natl Center for Youth Issues, October 1, 2010), cover price $9.95

9780760840085 | Sundance Pubns, July 1, 2002, cover price $6.25

9780385254755 | Doubleday, July 1, 1995, cover price $39.95 | also contains Kitanai and Filthy Flamingo Wash Up

9780517593486, titled "Fingerprints of the Gods" | Crown Pub, May 1, 1995, cover price $27.50 | About this edition: A search for evidence of a pre-ancient, advanced civilization speculates about an Atlantis-like world and makes predictions about forthcoming geological disasters

9780517887295, titled "Fingerprints of the Gods" | Reissue edition (Three Rivers Pr, March 1, 1996), cover price $22.00 | About this edition: A search for evidence of a prehistoric, advanced civilization speculates about an Atlantis-like world buried beneath Antarctic ice and makes predictions about forthcoming geological disasters.

9781574531091, titled "Fingerprints of the Gods" | Abridged edition (Audio Literature, August 1, 1997), cover price $17.95