 After 1775 we have some account of its operations in the letters of Joseph and Charles HOFF, who were Lord STIRLING's managers at Hibernia, and whose letters to their principal have been preserved.In that year Joseph HOFF, a brother-in-law of Benjamin COOPER, came from Hunterdon county to take charge of the works.He was assisted at first, and at his death, in 1777, succeeded by his brother Charles HOFF jr., who was in turn assisted by a younger brother John.