30 books • 2 series
Hopalong Cassidy Western Collection Volume 4 Books 10,11 (Hopalong Cassidy Collection, #4)
Hopalong Cassidy Western Collection Volume 2 Books 4,5,6 (Hopalong Cassidy Collection, #2)
Hopalong Cassidy Western Collection Volume 3 Books 7,8,9 (Hopalong Cassidy Collection, #3)