Picture from Michele Curatola.

Cover art by Davis Meltzer. Seventh Ace printing: September 1980

Picture and information from Dan Thompson.

Ace printing 1980 is credited to Davis Meltzer, but the cover artwork has a signature of Walter Velez by the right boot of the spacesuit.

Additional information from Peter Vialls

Here is a paperback edition 'The Defiant Agents' by Andre Norton. Ace Books, copyright 1962; # 14231, original cover price 60 cents. This is book #3 in the Time Traders series.

Picture and information from Richard Ulisky.

ACE single 14235-4; cover by Davis Meltzer; 1978; 6th printing.

Picture and information from ACE covers library .