Survey of London: Volume 9, the Parish of St Helen, Bishopsgate, Part I. Originally published by London County Council, London, 1924.
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Minnie Reddan, Alfred W Clapham, 'Plate 117: St Helen's, Bishopsgate, floor slabs', in Survey of London: Volume 9, the Parish of St Helen, Bishopsgate, Part I( London, 1924), British History Online https://prod.british-history.ac.uk/survey-london/vol9/pt1/plate-117 [accessed 19 January 2025].
Minnie Reddan, Alfred W Clapham, 'Plate 117: St Helen's, Bishopsgate, floor slabs', in Survey of London: Volume 9, the Parish of St Helen, Bishopsgate, Part I( London, 1924), British History Online, accessed January 19, 2025, https://prod.british-history.ac.uk/survey-london/vol9/pt1/plate-117.
Minnie Reddan, Alfred W Clapham. "Plate 117: St Helen's, Bishopsgate, floor slabs". Survey of London: Volume 9, the Parish of St Helen, Bishopsgate, Part I. (London, 1924), , British History Online. Web. 19 January 2025. https://prod.british-history.ac.uk/survey-london/vol9/pt1/plate-117.