By the Honorable Thomas Hutchinson, Esq ; Lieutenant-governor and commander in chief in and over HIs Majesty's province of the Massachusetts-Bay ... A proclamation for a public thanksgiving : ... Thursday the sixth day of December next ... Given at the Council chamber in Cambridge, the thirtieth day of October, 1770 . (Printed by Richard Draper, printer to His Honor the lieutenant-governor, and the Honorable His Majesty's Council, 1770)