( 1) Ordnance Survey Map (Scale / Date)
OS 25" 1961
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( 2) R Allen Brown, H M Colvin and A J Taylor 1963 The history of the King's Works, volume 2 : the Middle Ages
Page(s)566
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( 3) General reference
Norman F M. 1907. The official guide to fortifications of Berwick upon Tweed, 12
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( 4) Field Investigators Comments
F1 DS 18-MAY-67
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