Creaciones
| ▲Título▼ | ▲C▼ | ▲Año▼ | △V▼ | ▲Concepto▼ |
|---|
| 1920s Forensic Arts (junto a Gary O'Connell) |   | 1994 | — | Escritor |
| The Adventure Begins |  | 1986 | — | Escritor |
| After The Big One (junto a Earl Geier y Lynn Willis) | | 1990 | — | Escritor |
| Alien Races (junto a Scott David Aniolowski) | | 1993 | — | Escritor |
| The Andaman Islands (junto a Kevin Ramos y Carolyn Schultz-Savoy) | | 1986 | — | Escritor |
| Appendices (to "The Fungi from Yuggoth") |  | 1984 | — | Escritor |
| Arkham Advertiser, Thursday, Oct. 11, 1928 (junto a John B. Monroe y Lynn Willis) |  | 1990 | — | Escritor |
| Arkham, a Summary | | 1998 | — | Escritor |
| The Azathoth Papers (junto a Carolyn Schultz-Savoy) | | 1986 | — | Escritor |
| On Becoming an Investigator (junto a Kevin Ross) |  | 1994 | — | Escritor |
| Books of the Cthulhu Mythos (junto a Kevin Ross) | | 1992 | — | Escritor |
| A Brief History of Arkham | | 1990 | — | Escritor |
| A Brief History of the Written Word (junto a Dan Harms y Kevin Ross) |   | 2000 | — | Escritor |
| The Case | | 1990 | — | Escritor |
| Chapter VIII: Day of the Beast | | 1984 | — | Escritor |
| Conclusion: Foiling the Brotherhood | | 1984 | — | Escritor |
| Creatures of the Mythos ("Ye Booke of Monstres") (junto a Scott David Aniolowski, Fred Behrendt, John Carnahan et al.) | | 1994 | — | Escritor |
| Creatures of the Mythos ("Malleus Monstrorum") (junto a Marion Anderson, Scott David Aniolowski, Bruce Ballon et al.) | | 2006 | — | Escritor |
| Creatures of the Mythos ("The Creature Companion") (junto a Scott David Aniolowski, Shannon Appelcline, Bill Barton et al.) | | 1998 | — | Escritor |
| Creatures of the Mythos ("Ye Booke of Monstres II") (junto a Phil Anderson, Marion Anderson, Bill Barton et al.) | | 1995 | — | Escritor |
| The Cthulhu Mythos |  | 1992 | — | Escritor |
Dawn Biozyme  (junto a Earl Geier y Lynn Willis) | | 1990 | — | Escritor |
| Dead Of Night | | 1990 | — | Escritor |
| Deities of the Mythos ("Malleus Monstrorum") (junto a Phil Anderson, Marion Anderson, Scott David Aniolowski et al.) | | 2006 | — | Escritor |
| Deities of the Mythos ("The Creature Companion") (junto a Phil Anderson, Marion Anderson, Scott David Aniolowski et al.) | | 1998 | — | Escritor |
