| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| GURPS Cliffhangers | 978-1-55634-589-0 (1-55634-589-5) | 2002 |
| GURPS WWII All the Kings Men | 978-1-55634-640-8 (1-55634-640-9) | 2004 |
Brain Underdahi · Brian J. Underhill · Brian O. Underhill · Brian Underdahl · Brian Underdown · Brian Underwood