Ballantine Books, 1955 Series
 
Cover for Mad Strikes Back (Ballantine Books, 1955 series) #106
Cover for Mad Strikes Back (Ballantine Books, 1955 series) #297K
Cover for Mad Strikes Back (Ballantine Books, 1955 series) #491K
Cover for Mad Strikes Back (Ballantine Books, 1955 series) #U2102
Cover for Mad Strikes Back (Ballantine Books, 1955 series) #01564
Cover for Mad Strikes Back (Ballantine Books, 1955 series) #03373-6