20 collected letters between Barnard and Michael Gratz. Some letters discuss financial dealings and some letters written partially in yiddish.; American Philosophical Society
Correspondence between John Clark, Michael Gratz, and Barnard Gratz regarding the estate of George Croghan. Clark is attempting to be paid from the estate of George Croghan due to debts and is asking Gratz, who inherited the estate, to pay him.; There are other documents in the Gratz papers that discuss the Croghan estate.; American Philosophical Society
13 collected letters between Isaac Moses, Michael Gratz and Barnard Gratz. Various notes and receipts of financial dealings.; American Philosophical Society