American astronomer, physicist, and aviator (1834–1906), who conducted some of the first manned flights with his Army–funded Aerodrome aircraft. ALS signed “S. P. Langley,” one page, 4.5 x 7, personal letterhead, December 25. Letter to Mrs. Michaelis, in part: “I am a little unwell and if I should not be able to be with you by 6 tonight do not wait a minute for me.” In fine condition. Pre-certified PSA/DNA.
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