Context of Observations resulting from surveys, levels and views made on the East Fen, : The low Grounds and Fens adjoining thereto, belonging to the Soke of Bolingbroke, East Holland, and the Level Towns; with a report of the causes of their present drowned state and condition: also schemes for the drainage thereof, and Estimates of the Expence of executing those Schemes, &c. By John Grundy of Spalding, Lincolnshire, Engineer. 1774