| ▲Título▼ | ▲C▼ | ▲Año▼ | ▲V▼ | △Concepto▼ |
|---|---|---|---|---|
Chapter 10: The City of the Elder Things (junto a Charles Engan, Janice Engan y Mike Lay) |   | 1999 | — | Escritor |
Chapter 4B: SS Gabrielle (junto a Charles Engan y Janice Engan) |  | 1999 | — | Escritor |
Antarctica Map (Starkweather-Moore Expedition) |  | 1999 | — | Ilustrador |
| Appendices (to "Beyond the Mountains of Madness") (junto a Marion Anderson, Phil Anderson, Charles Engan et al.) | | 1999 | — | Ilustrador |
| Handouts (to "Beyond the Mountains of Madness") (junto a Charles Engan, Janice Engan, John Goodrich y John T. Snyder) | | 1999 | — | Ilustrador |
