| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| GURPS International Super Teams: A Heroic World for Super-Powered Roleplaying | 978-1-55634-192-2 (1-55634-192-X) | 1991 |
| GURPS Mage The Ascension *OP | 978-1-55634-284-4 (1-55634-284-5) | 1994 |
| GURPS Shapeshifters | 978-1-55634-452-7 (1-55634-452-X) | 2003 |
M S. · R. M. · R. S. · Robert M. · Robert S. · Robert Schroeck