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 21: Tower 9', in An Inventory of the Historical Monuments in City of York, Volume 2, the Defences, (London, 1972) pp. 21. British History Online https://www.british-history.ac.uk/rchme/york/vol2/plate-21 [accessed 5 May 2024]
Tower 9
Tower 9 from S.W. Mid 13th-century.
Tower 9 and inner face of city wall from N.E. 13th-century and later.