[LB059367], Letter from Thomas Alva Edison to Henry S Munsor, March 17th, 1897
https://edisondigital.rutgers.edu/document/LB059367
Transcription
March 17 97 Henry S. Munsor Esq. 41 East 49th Street New York. Dear Sir:- In reply to your favor of the 10th inst. I beg to state that I am now trying a Mining Experiment that has cost me $1,450.000. and I must use every penny I can raise to see it through. Yours truly Thos. A. Edison R[andolph]