Radix Tetrad

The Radix Tetrad is a group of four science fiction books by A. A. Attanasio. The first novel, the Nebula Award-nominated Radix, was published in 1981, and the last novel, The Last Legends of Earth, was published in 1989.

The Tetrad

 * Radix (1981)
 * In Other Worlds (1984)
 * Arc of the Dream (1986)
 * The Last Legends of Earth (1989)