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 35: City Wall. Tower 31', in An Inventory of the Historical Monuments in City of York, Volume 2, the Defences, (London, 1972) pp. 35. British History Online https://www.british-history.ac.uk/rchme/york/vol2/plate-35 [accessed 19 April 2024]
City Wall. Tower 31
City Wall and rampart N.W. of Monk Bar. 13th-century and later.
Tower 31 (Harlot Hill Tower) with city wall, rampart and ditch to Monk Bar, from E. 13th-century and later.