Ryan Costello
Books
Pathfinder Adventure Path #59: The Price of Infamy
2012
ISBN 9781601254214
Tempest Rising
2012
ISBN 9781601254139
Pathfinder Roleplaying Game: Ultimate Equipment
2012
ISBN 9781601254498
Pathfinder Roleplaying Game: Ultimate Campaign
2013
ISBN 9781601254986
The Collected Monsters of Sin
2013
ISBN 9781936781225- No cover
Pathfinder 2 - Zeitalter dVO: Legenden
2021
ISBN 9783963313776 
Strategists and Tacticians
2010
ISBN 9780982551035- No cover
What's in Mrs. Fritz's Hair?
2008
ISBN 9780981113609 - No cover
Aliens Stole Pizza Day!
2008
ISBN 9780981113616