The history of the ancient and present state of the navigation of the port of King's-Lyn, and of Cambridge : and the rest of the trading towns in those parts, and of the navigable rivers that have their course through the great level of the Fens, called Bedford Level : also the history of the ancient and present state of draining in that level ... with the method proposed for draining the said Fens, and amending the harbour of Lyn : by Col. John Armstrong ... illustrated with maps.