During a mysterious plague on the Ganymede colony, Bob Wilson discovers alien but friendly Jovians, who may have an antiodote if only Bob could communicate with them.
Used availability for Lester del Rey's Outpost of Jupiter
2000 : USA Library Binding
December 1964 : UK Hardback
January 1978 : USA Mass Market Paperback
1978 : USA Paperback
Title: Outpost Of Jupiter: Without the lifeline of vital supplies, the colonists would all die--yet Earth had placed them under on unbreakable quarantine!
Author(s): Lester Del Rey
ISBN: 0-318-73315-3 / 978-0-318-73315-9 (USA edition)
Publisher: Ballantine Books
October 1977 : USA Mass Market Paperback