THE SINGERS OF TIME.
Edition: First printing, a trade paperback, issued simultaneously with hardcover.
New York: Doubleday, (1981). First edition - A turtle like race of aliens have conquered Earth, imposing gentleness on humans and outlawing destructive technology,but when their home planet disappears into a black hole, the aliens' only hope for the future hinges on the possibility that humanity's flawed sciences might contain a glimmer of truth. 358 pp. ISBN: 0-385415265.
Condition: Very good in glossy illustrated wrappers.