Collection search - Plan of a citadel on Cap Diamond for improving the fortifications of Quebec, being Capt. Harry Gordon's Engineer his project with some insignificant alterations, relative to an estimate of this date. Quebec, 12th April 1769, John Marr, Engr. To His Excellency Brigr General Carleton, Commanding his Majesty's Forces in the Northern District of North America &c &c &c. [architectural drawing]