Here are two old novels by Lester Del Rey that I found through Paperback Swap dot com. I haven't read these yet either.
Copyright 1956 by Lester Del Rey
First Printing: June 1956
Fifth Printing: February 1974
Ballantine Books, Inc. New York, N. Y.
To Frederick Pohl for insistence, persistence, assistance -- and existance!
Moon of Mutiny
Copyright 1961 by Lester Del Rey
First Printing, November 1969
Signet published by New American Library, Inc.
New York, New York
To Paul Waterman