An account of the trigonometrical survey carried on in the years 1791, 1792, 1793, and 1794 by order of His Grace the Duke of Richmond, ... By Lieut. Col. Edward Williams, and Capt. William Mudge, of the Royal Artillery; and Mr. Isaac Dalby. Communicated by the Duke of Richmond, F.R.S. From the Philosophical transactions - Williams, Edward Colonel (1795)