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GLASS PLATE NEGATIVE. Title at top right of page : 'A Map of the River Ouse from its Rise near Ousborn in the West Riding of the County of York to its Falling into the Trent and Humber […] Surveyed by Willm. Palmer & Partners in December 1725'. Also at the bottom: 'A Scheme of the Spring Tydes, Shewing the Surface of the Water at every Hour, both in its Flow and Ebb, drawn from the Watermen's [?] Report [?] that it is High Water at Hull, when Flood at Ayres Mouth; High Water at Ayres Mouth when Flood at Wharf Mouth and High Water at Wharf Mouth when Flood at York'.