The Starchild Trilogy

From Author Wars - https://authorwars.com/publications/the-starchild-trilogy-232029.html

Overview:

Title: The Starchild Trilogy
Author: Frederik Pohl, Jack Williamson
Year: 1983
ISBN-10: 0671469045
Publisher: Timescape / Pocket Books
Price: $3.95
Pages: 442
Binding: Paperback
Type: Omnibus
Title Reference: The Reefs of Space
Notes: Stated 6th printing as per number line. Locus #267 (April 1983) gives the ISBN as 0-671-46814-6, but research shows no editions with that ISBN.