| ▲Título▼ | ▲C▼ | ▲Año▽ | ▲V▼ | ▲Concepto▼ |
|---|---|---|---|---|
| The Role of Prohibition (junto a Lynn Willis) |   | 1994 | — | Escritor |
| Illustrations for "The Fungi from Yuggoth" (junto a Chris Marrinan) |   | 1984 | — | Ilustrador |
| Sourcebook for the 1920s (junto a Yurek Chodak, Harry Henderson, Steve Perrin, Sandy Petersen, Greg Stafford y Lynn Willis) | | 1981 | — | Escritor |
