There are 3 books by Robert T. O'Brien on BookOrb. A strong starting point is The toppled pawn (2008). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Robert T. O'Brien written?
BookOrb lists 3 books by Robert T. O'Brien.
Where should I start with Robert T. O'Brien?
A good starting point is The toppled pawn (2008).
What is the Robert T. O'Brien books in order list?
In publication order: 1. Thoracic Radiology for the Small Animal Practitioner (2001), 2. Abdominal Ultrasound For The Small Animal Practitioner (2007), 3. The toppled pawn (2008).