April 10, 1952
Dear Ed:
Thank's [sic] for your letter of the 8th.
To the best of my present knowledge, I'll not be at the Boston meeting.  This is just as well: I don't see how you'll have time to squeeze anyone else in.  But if there are any changes of plan, I'll get in touch with you at Boston and will give Zinder your message.
Joshua
P.S.  58-161?
PPS.  Ref. your letter, 2d line: "indicated you would take part"