By T. J. Bass. 1974. This edition, 1983. Cover art by Darrell K. Sweet. A sequel (of sorts) to Half Past Human.
By Robert Silverberg. 1990. Book design by H. Roberts. Cover illustration by Michael Whelan. Cover design by Don Puckey. Sequel to At Winter’s End.
By Robert Silverberg. 1988. Cover illustration by Michael Whelan.
By Marvin Kaye and Parke Godwin. 1982. This edition, 1984. Cover art by John Harris. Sequel to The Masters of Solitude.
By Andre Norton. 1952. This edition, 1985. Cover artist, Laurence Schwinger.