SS Lord Gough pass. list for 20May1888 Phillie

Hoping to find, at little or no cost[:D], the passenger list for the SS Lord Gough arrival 19 or 20 May 1888 in Philadelphia, Pennsylvania. Specifically hoping to verify that my great-grandparents Johan Olsen Bjorgum and Ellen Ashiem were on that ship, along with Johan's sister, Ingaborganna. Thanks, Meg