There are 2 books by William Patrick O'Brien on BookOrb. A strong starting point is Merchants of Independence (2014). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has William Patrick O'Brien written?
BookOrb lists 2 books by William Patrick O'Brien.
Where should I start with William Patrick O'Brien?
A good starting point is Merchants of Independence (2014).
What is the William Patrick O'Brien books in order list?
In publication order: 1. Gateways to commerce (1992), 2. Merchants of Independence (2014).