There are no copyright notices on the dust jacket.
Using the search term "Dead Zone" and looking at the year 1979, we see that there are two possibly relevant copyright numbers: V1763P283 and TX0000333388.
Copyright registration numbers must be 12 characters long, so we can disregard V1763P283.
TX0000333388 only refers to the literary work and not the dust jacket.
Thus there are no copyright registrations for the dust jacket. The entire jacket is placed into the public domain.