An Inventory of the Historical Monuments in City of York, Volume 2, the Defences. Originally published by Her Majesty's Stationery Office, London, 1972.
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'Plate 43: Layerthorpe Postern and Towers 34 and 33', in An Inventory of the Historical Monuments in City of York, Volume 2, the Defences( London, 1972), British History Online https://www.british-history.ac.uk/rchme/york/vol2/plate-43 [accessed 12 December 2024].
'Plate 43: Layerthorpe Postern and Towers 34 and 33', in An Inventory of the Historical Monuments in City of York, Volume 2, the Defences( London, 1972), British History Online, accessed December 12, 2024, https://www.british-history.ac.uk/rchme/york/vol2/plate-43.
"Plate 43: Layerthorpe Postern and Towers 34 and 33". An Inventory of the Historical Monuments in City of York, Volume 2, the Defences. (London, 1972), , British History Online. Web. 12 December 2024. https://www.british-history.ac.uk/rchme/york/vol2/plate-43.