U.S.A. trilogy was created in 1930.
The Darkangel Trilogy was created in 1982.
The Bounty Trilogy was created in 1936.
The Wimbledon Trilogy was created in 1993.
Gorse Trilogy was created in 1953.
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.
The Corellian Trilogy was created in 1995.
The Trilogy - album - was created in 2004.