This Public Ledger clipping explains the relocation of Wilson-Martin’s slaughterhouse operations from the area of 30th & Market to Gray’s Ferry.
Philadelphia Public Ledger, 29 June 1931, via David Rotenstein, “Slaughterhouses on the Schuylkill,” https://blog.historian4hire.net/2015/09/22/slaughterhouses-on-the-schuyl...