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Birk Sike
county:-   Durham
locality type:-   river
1Km square:-   NY8026 (etc) 
10Km square:-   NY82

evidence:-   old map:- Jefferys 1770 (Wmd) 
placename:-  Birk Syke
source data:-   Map, 4 sheets, The County of Westmoreland, scale 1 inch to 1 mile, surveyed 1768, and engraved and published by Thomas Jefferys, London, 1770.
image
J5NY72NE.jpg
"Birk Syke"
single or double wiggly line; river; county boundary? 
item:-  National Library of Scotland : EME.s.47
Image © National Library of Scotland

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