I have tried contacting many different people about this without any success. Morkovin died in 2015 around the time I learned about the paper. His family has never responded to my correspondence and I do not believe they have a copy. The one professor who did have a copy of it threw out his collection of papers a few years before I asked him. Morkovin was a professor at the Illinois Institute of Technology and they do not have it in their archives. Morkovin likely wrote the paper while working for the Martin Company (now merged into Lockheed Martin). It is likely that the paper was also filed as a Martin Company research report, but I later learned that Lockheed Martin has no copies of the Martin Company research report series since the Martin Company apparently destroyed the paper copies intentionally before the merger (I have no detail past that). NATO published other papers from this conference but not this one. They may have a copy but they have never replied to my correspondence.

I do know of a professor looking for a copy of this paper, but he has also not found it either. It would be nice to find a copy, but it's not a high priority for me.

http://trettel.org/papers-to-find.html

https://www.gwern.net/Fulltext