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What does the "RPF;ht" at the bottom stand for? (I vaguely recall this being an old convention of something?)

'ht' is Helen Tuck, the secretary at Caltech's Theory Group for many years; that mark indicates she typed the letter. I was there many years after Feynman passed away, but I have fond memories of Helen and some of the stories she had to tell about the "old days".

They're the initials of the author (in caps) and the typist (in lowercase).

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