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Birkfell Slack
runs into:-    Ullswater

civil parish:-   Patterdale (formerly Westmorland)
civil parish:-   Martindale (formerly Westmorland)
county:-   Cumbria
locality type:-   river
locality type:-   boundary
locality type:-   parish boundary (?) 
1Km square:-   NY4018 (etc) 
10Km square:-   NY41

evidence:-   old map:- OS County Series (Wmd 12 7) 
placename:-  Birkfell Slack
source data:-   Maps, County Series maps of Great Britain, scales 6 and 25 inches to 1 mile, published by the Ordnance Survey, Southampton, Hampshire, from about 1863 to 1948.

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