The Breaking of Northwall by Paul O. Williams ( Del Rey | 2nd. Printing | 1981 )

World of Ptavvs by Larry Niven Del Rey Paperback Book 1981

Major Operation by James White 1981 Del Rey Paperback

Iceworld by Hal Clement Vintage Paperback Ballantine 2nd Printing 1981 EX

The Long Result by John Brunner 1981 Del Rey 2nd Printing Paperback

1983 THE WEBS OF EVERYWHERE by John Brunner GD+ 2.5 1st Del Rey Paperback

The Long Result by John Brunner 1981 Del Rey 2nd Printing Paperback Good

1981 THE ALIENS AMONG US by James White FN 6.0 2nd Del Rey Paperback