Letter from Mount Sinai Cemetery Association of Pennsylvania to Isaac Leeser;October 25, 1853 A letter from the Mount Sinai Cemetery Association of Pennsylvania, soliciting Isaac Leeser to attend a meeting on October 27, 1853, at 6 PM at Efrish & Engel, 256 North 3rd Street above Willow, Philadelphia. The letter is signed by I. Hartman, secretary.