ACE 6th Printing c. 1978. Cover Art By JOHN POUND.

Picture and information from paperchase2000 via ebay.com.

The novel is copyrighted 1978 and my copy is marked on the front as "first publication anywhere", with "First Ace printing: November 1978" inside. I would estimate sixth printing as being in 1980s.

Comment from Stephen J West.

ACE single 95490 (1978).

Picture and information from ACE covers library .