An Inventory of the Historical Monuments in Hertfordshire. Originally published by His Majesty's Stationery Office, London, 1910.
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'Plate 35: Verulam, Roman Wall', in An Inventory of the Historical Monuments in Hertfordshire, (London, 1910) pp. . British History Online https://www.british-history.ac.uk/rchme/herts/plate-35 [accessed 13 April 2024]
Verulam: Roman Wall.
St. Germain's Block.