| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Circle of Twelve | 978-0-9833073-1-0 | 2011 | Ted Gagliano · Robert T. O'Brien |
| The Toppled Pawn | 978-0-9833073-0-3 | 2011 | Robert T. O'Brien |
| Thoracic Radiology for Small Animal Practitioner | 978-1-893441-22-4 | 2001 | Robert T. O'Brien · Robert O'Brien |
| Thoracic Radiology for the Small Animal Practitioner | 978-1-893441-08-8 | 2000 | Robert T. O'Brien |
O'Brien · R. B · R. T. · Robert B. · Robert Brien · Robert O. · Robert O'Brien · Robert T. · T. B. · T O'Brien