Outpost of Jupiter by Lester Del Rey (Del Rey paperback 1978)

The Mysterious Planet by Lester Del Rey 1978 First Ballantine Edition

Outpost of Jupiter - Paperback, by Del Rey Lester - Acceptable

Outpost of Jupiter Ballantine Del Rey, Lester VG Science Fiction Vintage 1978

Outpost of Jupiter by Lester Del Rey - Ballantine 2nd Printing 1978 - Paperback

The Mysterious Planet by Lester Del Rey 1978 Ballantine Paperback Sci Fi

The Mysterious Planet by Lester del Rey Vint. 1978 PB First Ballantine Printing

Rocket Jockey By Lester Del Rey Ballantine PB Book Sci-fi SFF Space Travel 1978.