TLS, one page, 8.5 x 11, personal letterhead, February 17, 1916. Letter to E. Kohan, in full: “Many thanks for your note of February 16, in which you outline some of your ideas concerning the substance ‘of the energy known to us as heat.’ I am interested to note what you say, and am at all times glad to hear from you relating to this or allied subjects.” In fine condition.
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