[LB054122], Letter from Alfred Ord Tate to Thomas Egleston, Columbia College. School of Mines, October 31st, 1891
https://edisondigital.rutgers.edu/document/LB054122
Transcription
Oct. 31, 1891. Mr. Thomas Egleston, School of Mines, Columbia College, New York City. Dear Sir:- Replying to your letter of 20th instant, I regret to say that Mr. Edison is not ready yet to furnish information in regard to his process for the treatment of copper ores. Yours very truly, A. O. Tate Private Secretary.