I had two books by this author back in the 1980s when I was a teenager. Both books were pretty thin paperbacks (no more than 100 or so pages). One book was about science fiction movies, mostly from the 1950s. I remember the cover of the book had one or two of the spaceships from the original "War of the Worlds," along with one of the aliens. I think that one of the big-brained aliens from "This Island Earth" was on the cover too.
The horror/monster movie book featured a lot of Ray Harryhausen movies, Japanese kaiju movies, and the omnipresent giant bug movies of the 1950s. This book featured Gorgo (England's answer to Godzilla) and Rodan on the cover.
I've been wracking my brain trying to remember the names of both books, along with the author's name. Like I said, he wrote both books. Thanks!!!