( 1) Ordnance Survey Map (Scale / Date)
OS 25" 1884
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( 2) General reference
Transactions of the Worcestershire Naturalists Club 5 1912 300-2 (W H Duignan)
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( 3) 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)977-8
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(4) David J Cathcart King 1983 Castellarium anglicanum : an index and bibliography of the castles in England, Wales and the Islands. Volume II : Norfolk-Yorkshire and the islands
Page(s)508
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(5) English Heritage Alternative Action Report
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