There are 15 books by Robert R. O'Brien on BookOrb. A strong starting point is Nellie Cashman, frontier angel (Leveled readers) (2003). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Showing 2 of 15 titles.
Frequently asked questions
How many books has Robert R. O'Brien written?
BookOrb lists 15 books by Robert R. O'Brien.
Where should I start with Robert R. O'Brien?
A good starting point is Nellie Cashman, frontier angel (Leveled readers) (2003).
What is the Robert R. O'Brien books in order list?
In publication order: 1. Balto, the Dog Who Saved a City. (Spotlight Books/comprehension Books (1997), 2. Nellie Cashman, frontier angel (Leveled readers) (2003).