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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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Citation:
York Castle: Clifford's Tower, Details.
Clifford's Tower. Corbels and garderobe shoots. c. 1250.
Clifford's Tower. Corbels of N.E. bartizan.
Tower 23. Arrow slit and gunport. c. 1460.