COLT Studio Group · G. C. · S.C. · S. G.
| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| Colt Leather 2013 Calendar | 978-1-880777-42-8 (1-880777-42-8) | 2013 | Colt Studio Group |
| Colt Leather 2014 Calendar | 978-1-880777-88-6 (1-880777-88-6) | 2013 | |