( 1a) General reference
BM.Royal Mss, Tract addressed to Lord Burghley, AD 1590
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( 1) General reference
Hist & Ant of Roxb, IV, 1864, facsimile of map, p.232 (A.Jeffery)
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(2) Denis R Perriam and John Robinson 1998 The medieval fortified buildings of Cumbria : an illustrated gazetteer and research guide
Cumberland and Westmorland Antiquarian and Archaeological Society extra series vol.29 Page(s)228
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