One Against Herculum/Secret of the Lost Race Ace Double Vintage Sci-Fi PB

This is a vintage Ace Double Novel book featuring One Against Herculum by Jerry Sohl and Secret of the Lost Race by Andre Norton. It has been stored in a plastic sleeve and only been taken out of the bag to photograph and assess any notable flaws. It will have the old book smell. Please see pictures for the condition of the book - all angles of the book have been provided. It shows normal wear of a vintage paperback. Notably, there is a crease near the spine on the Secret of the Lost Race cover and a small tear at the top of its spine as well as a few creases on the cover of the One Against Herculum. Please ask any questions.