M. Fithian, Publisher, was here in the 1800s. I saw the address on a copy of the front page of a book about silk growers in America in the Philadelphia Inquirer, 11/22/15, at p. C2. I think I have the location correct, but there does not seem to be a 61 currently. If you have better information, please comment below. The building was erected in 1909, designed by Sauer & Hahn, according to https://www.philadelphiabuildings.org/pab/app/pj_display_alldates.cfm/167445.