Not long ago I was mousing through the web and came across two studies by Berkey that were up for sale. They looked oddly familiar, and then I realized that they were preliminary art for the cover of a 1976 book I've owned for nearly 40 years. Since the cover art wasn't of a space ship, I never connected it with Berkey. But I flipped to the back flap and, sure enough, John Berkey was listed as the artist.
The subject is a 1930 or 1931 Cadillac V-16 Town Brougham by Fleetwood shown sitting in front of the Plaza Hotel in New York City.
Below are Berkey's studies along with a scan I made of the cover. To enlarge, click on the images.