As WH Allen added the United States to its distribution cycle, it also took ten of the Doctor's adventures,  both old Third and Fourth Doctor adventures, and gave them distinct covers. For The Day of the Daleks, WH Allen put a UNIT spacecraft and a gorilla on the cover (at the time, Star Wars was very popular), but kept the Target writing intact. They also added a foreward by Harlan Ellison (who had a feud with Gene Rodenberry, Star Trek creator) and a description of the main characters!