Source: Allen W. Dulles Papers at Princeton University–Series 4: Warren Commission Files — Nix Film Analysis (h/t)
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The Mary Bancroft Collection would be of interest here. Let’s be clear, a competent spy would not write a letter with TS material. Nor retain same. And how secure would such a worthy consider Harvard? That said, sure does line up well with the original 75 year seal of THE WARREN REPORT, eh?
“Access. Unrestricted. Several letters removed from #40 are closed until January 1, 2037.”