The Corellian Trilogy was created in 1995.
In the Star Wars mythos, there are two planets in the Corellian System named Talus and Tralus. They both orbit around the same barycenter, therefore they are "sister planets." There is a space station at the barycenter called Centerpoint Station, which played a major role in the Corellian Trilogy of books.
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.
U.S.A. trilogy was created in 1930.