( 1) Ordnance Survey Map (Scale / Date)
OS 6" 1931-8
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( 2) General reference
"Early Portsmouth Defences" 1923 39 (H T Lilley)
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( 3) General reference
Map of Portsmouth 1668 by Gomme, Original in Brit Mus
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( 4) Field Investigators Comments
F1 DS 09-AUG-55
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