Paradise trilogy was created in 2012.
The first book of the "Leaving Paradise" trilogy is Leaving Paradise! Then it's Return to Paradise.
Cairo Trilogy was created in 1956.
Larklight trilogy was created in 2006.
The Beaver Trilogy was created in 2001.
The Prodigal Trilogy was created in 2008.
Viking Trilogy was created in 1957.
Underworld Trilogy was created in 2010.
U.S.A. trilogy was created in 1930.
The Corellian Trilogy was created in 1995.
The Trilogy - album - was created in 2004.
Seiddab Trilogy was created in 1985.
The Barrytown Trilogy was created in 1992.