Hancock R, very rare 18th century View of the Waterfall of Niagara - a 'Perspective view' of Niagara drawn by Hancock, by Robert Sayers' view published in London, circa 1751-1770, which in turn derived from the view of the falls first published in Louis Hennepin, Nouvelle decouverte, Utrecht, 1697. Robert Sayer (1735-1774) England 23 x 38.5 cm