Nick,I've read through the press articles from July 1947, and all I see are stories about a crashed disk. They don't mention a single body. The earliest reference I can find to bodies is in a Frank Scully book, and that's in regard to Aztec, not Roswell. Do you know of any published accounts about Roswell bodies from before 1980?
The closest I can think of is that in 1979 the "UFO Ohio Yearbook 1979" was published. I have a copy of this. Page 16 gives a summary of Roswell and Marcel (who is described as "Major J.M.") and Leonard Stringfield speculates the bodies of the crew were destroyed in the explosion. So, yes this is a pre-1980 published comment on the bodies, but it's not an account on the bodies from a witness, it's just an observation from a researcher.
I meant it gives a summary of Marcel's story and of Roswell. I didn't mean Marcel and Stringfield speculated on the bodies. It was just Stringfield who speculated on the bodies.
I remember reading a story that the UFO was actually a new capture Nazi weapon being tested.