Third Ace printing: October 1973.

Picture and information from Dan Thompson.

Plague Ship, Ace Double #D-345, Copyright 1956. Writing as 'Andrew North'

Picture and information from Dan Thompson.

Cover by Valigursky, published with Voodoo Planet

Information from ACE covers library .

The book should be July 1964 ("First Ace Printing")

Comment from Stephen J West.

This edition published in 1978 by Gregg Press A Division of G. K. Hall & Co. by arrangement with Andre Norton. First Printing, February 1978!

Picture and information from wlhardy@atlantic.net.

Magnet books (Victor Gollanz paperback), 1979 UK. Art by Tony Roberts.

Picture and information from Peter Vialls.