( 1) Ordnance Survey Map (Scale / Date)
OS 1:10 560 1966
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( 2) by Ian V Hogg 1974 Coast defences of England and Wales, 1856-1956
1974 Page(s)179-98
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(3) Fortress Study Group Fort : the international journal of fortification and military architecture
11, 1983 Page(s)96
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(4) Andrew Pye and Freddy Woodward 1996 The historic defences of Plymouth
Page(s)169-72
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