( 1) General reference
A Handbook of Kent's Defences 1540-1945 1977 13 (D Bennett)
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( 2) General reference
The Medway Forts: A Short Guide 1976 17-18 (K R Gulvin)
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(3) Kent's Defence Heritage
Gazetteer Part 2: KD84
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(4) Fortress : the castles and fortifications quarterly
5, 1978 Page(s)77-85
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