Yeah, those are Mike Minor's work. I recognize a number of them from when they were printed in articles about him.
Other than the one resembling the pyramid Meidum that appeared in an article about Mike Minor in Starlog magazine, do you know at this point which other ones were reproduced--and in which periodicals they can be found? "A number of them" sounds worth investigating--unless that "number" is simply the number "one."
I recognize several of them but I don't recall exactly which articles in which they appeared. I do have a way to possibly verify. Let me write an email.