The plot suffers from Alpha Centauri syndrome, where the time traveler might as well be from Alpha Centauri as from the future, but seeing the emergence of Kirby’s high-perspective artwork gives this issue a boost. In addition, the story provides a powerful image of the pre-Vietnam cold war era and its prevailing assumptions about the roles of women in society.
I saw this in the theater with Deb Baker and Jon Shultis during a winter trip to Pittsburgh for a small computer science education conference.
The story continues in a 1990 sequel, Times Change.
If he dug it up now and carried it back to his ship, it would not be there for him to find on that high summer day in the twenty-third century. And if that was true, how could he be here, in this time, to dig it up at all?