An Inventory of the Historical Monuments in Westmorland. Originally published by His Majesty's Stationery Office, London, 1936.
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'Plate 66: Appleby, Appleby Castle, Keep', in An Inventory of the Historical Monuments in Westmorland, (London, 1936) pp. 66. British History Online https://www.british-history.ac.uk/rchme/westm/plate-66 [accessed 24 April 2024]
Appleby.
(3) Appleby Castle. Keep. Late 12th-century.