Creaciones
| △Título▼ | ▲C▼ | ▲Año▼ | ▲V▼ | ▲Concepto▼ |
|---|
| About Monstres |   | 1994 | — | Escritor |
| Adventure Summary (junto a Charlie Krank, Eric Rowe y Lynn Willis) |   | 1996 | — | Escritor |
| Alien Races (junto a Keith Herber) | | 1993 | — | Escritor |
| Alone on Halloween (junto a John Tynes) |   | 1992 | — | Escritor |
| Animals (junto a Marion Anderson, Sandy Petersen, Justin Schmid y Lynn Willis) | | 2006 | — | Escritor |
| Appendix (to "The Compact Trail of Tsathoggua") | | 1997 | — | Escritor |
| Beasts and Monsters ("Call of Cthulhu 5th Edition") (junto a Sandy Petersen y Lynn Willis) | | 1992 | — | Escritor |
| Broodhaven |  | 1992 | — | Escritor |
| Campbell Country (junto a Paul Carrick, Drashi Khendup y Gary Sumpter) | | 2001 | — | Escritor |
| The Campbell Mythos (junto a Drashi Khendup) | | 2001 | — | Escritor |
| Card Lists (junto a Charlie Krank, Eric Rowe y Lynn Willis) | | 1996 | — | Escritor |
| The Cards (junto a Eric Rowe y Lynn Willis) | | 1996 | — | Escritor |
| Carnivale Knowledge | | 1992 | — | Escritor |
| Coach Chase Rules (junto a Kevin Ross) |  | 2012 | — | Escritor |
| Cold War | | 1994 | — | Escritor |
| Cold Warning | | 2017 | — | Escritor |
| Creating Adventures (junto a Charlie Krank, Eric Rowe y Lynn Willis) | | 1996 | — | Escritor |
| Creatures of Legend & Folklore (junto a Sandy Petersen, Justin Schmid y Lynn Willis) | | 2006 | — | Escritor |
| Creatures of the Mythos ("Ye Booke of Monstres") (junto a Fred Behrendt, John Carnahan, Larry DiTillio et al.) | | 1994 | — | Escritor |
| Creatures of the Mythos ("Call of Cthulhu 5th Edition") (junto a Sandy Petersen y Lynn Willis) | | 1992 | — | Escritor |
| Creatures of the Mythos ("Malleus Monstrorum") (junto a Marion Anderson, Bruce Ballon, Bill Barton et al.) | | 2006 | — | Escritor |
| Creatures of the Mythos ("The Creature Companion") (junto a Shannon Appelcline, Bill Barton, Fred Behrendt et al.) | | 1998 | — | Escritor |
| Cthulhu Mythos Entities in Victorian Britain (junto a David Grilla) | | 2012 | — | Escritor |
| Curious Goods | | 1992 | — | Escritor |
| The Curse of Tsathoggua | | 1997 | — | Escritor |
