The Zero Stone
Book 1 in the Zero Stone/Murdoc Jern series; first published in 1968. This is an Ace paperback edition from probably the late 1960s/early 1970s (cover price $.75) with cover by Jeff Jones.
Andre Norton Books
My Personal Collection.
Copyright 2007-2012 by Mike Grimm; cover images are copyrighted by their respective owners, and are used here for illustrative purposes only.