TLS, one page, 7.25 x 10.5, personal letterhead, July 24, 1958. Letter to Colonel Richard Gimbel, curator of aeronautical literature at Yale University Library. In part: "I had not forgotten the promise I gave you in April, but since then there has been no opportunity for me to re-read the documents, as I had hoped, and I am not yet in a position to fulfill it. Because of my heavy schedule, the prospect of my getting to work at any time in the near future is very slim, but if and when I do, you will hear from me." In fine condition, with some light creasing to the upper left corner.
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