ALS, 4.5 x 7, July 30, 1929. In full: "I have just returned from abroad & find your letter of July 3 with the Pall Mall Magazine. I am glad of your effort to increase popular knowledge of science but I am too busy at the moment to write you anything for publication, though I wish you all success." In fine condition, with two small pieces of tape, and a rusty paperclip impression, to the top edge.
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