Partnership
Anne McCaffrey & Margaret Ball
Brain and Brawn Ships (2)
Child of Prophecy
Janny Wurts
Black Trillium
Andre Norton & Marion Zimmer Bradley & Julian May
Trilium Saga (1)
Dark Haven
Gail Z Martin
Chronicles of the Necromancer (3)
Tainted
Xyvah M. Okoye
Age of the Anathema (1)