Click the arrow to watch the film. Video source: wdtvlive42 YouTube channel.
Last week's Retro Saturday film was about Project Ranger, the first NASA attempt to map the Moon's surface.
That program was followed by Lunar Orbiter, a rather generic title that describes exactly the program's purpose.
Unlike Ranger, all five Lunar Orbiters launched and deployed successfully. The orbiters mapped 99% of the Moon's surface in preparation for arrival later in the decade by Apollo astronauts.
This week's film is a 7½ minute produced by the Boeing Company for NASA about the Lunar Orbiter program.