I must have misunderstood what you meant by "These are all US-based sources so I'm not sure what gave you that impression unless you only heard about it in the 60s/70s when it was embargoed/classified?
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No, what I mean was, I did most of my "history learning" about the Cuban Missle Crisis from my parents (my dad lived in florida at the time), and then in high school (just before the documents were declassified). I didn't really look back at the incident until fairly recently (IIRC while reading one of Rhodes's books about atomic weapons) and it was then that I learned about the Turkey missles. I don't think most people who heard about CMC are even aware (post declassification) that we had missles there. Knowing about those missles changed my opinion about the CMC a bit.