UnNamed
by Krista Gossett
series UnQuadrilogy
genres Other9
years 2018
Terradox Quadrilogy
by Craig A. Falconer
series Terradox
genres Science
years 2019
Martian Quadrilogy Box Set
by Brandon Ellis
series Mars Colony Chronicles
genres Fantasy
years 2019
Atlantis Quadrilogy - Box Set
by Brandon Ellis
series Atlantis
genres Fantasy
years 2018
The Deathless Quadrilogy
by Chris Fox
series Deathless
genres Nonfiction
years 2019
The Alien Artifact Quadrilogy 2014 (Novelette)
by V Bertolaccini
series
genres Other8
years 2014
The Sol System Renegades Quadrilogy: Books 1-4 of the Space Opera Thriller Series
by Felix R. Savage
series
genres Other3
years 2019
The Sol System Renegades Quadrilogy
by Felix R. Savage
series Sol System Renegades
genres Other6
years 2019
The Black Hole Experiments Quadrilogy (2017)
by V Bertolaccini
series
genres Other8
years 2015
HE WHO CROSSES DEATH: Star Warrior Quadrilogy Book 3
by Hooke, Isaac
series
genres Other11
years 2018
He Who Crosses Death (Star Warrior Quadrilogy Book 3)
by Isaac Hooke
series
genres Fantasy
years 2018
Fire - Betrayal
by Amelia Grace
series Katie’s Gate Quadrilogy
genres Science
years 2013
365 Days Hunted
by Nancy Isaak
series The 365 Days Quadrilogy
genres Young Adult
years 2017