Nebula Award Stories 4. ed. Poul Anderson. 1969

Richard Wilson Mother to the World
Terry Carr The Dance of the Changer and the Three
Kate Wilhelm The Planners
H H Hollis Sword Game
James E Gunn The Listeners
Anne McCaffrey Dragonrider

Richard Wilson. Mother to the World.
Originally in : Orbit 3

Post-Apocalypse Adam and Eve, with re-population requiring a ‘mentally retarded’ mother and mother-son incest. Nebula Award, Best Novelette, 1968.

James Gunn. The Listeners.
Originally in :

Taut psychological drama, following the head of a team who has many years leading a SETI team monitoring the radio waves, as the project comes under financial threat, and his relationship with his wife reaches a head.