An Inventory of the Historical Monuments in Hertfordshire. Originally published by His Majesty's Stationery Office, London, 1910.
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'Hadley', in An Inventory of the Historical Monuments in Hertfordshire, (London, 1910) pp. 107. British History Online https://www.british-history.ac.uk/rchme/herts/p107 [accessed 19 April 2024]
56. HADLEY.
(O.S. 6 in. xlv. N.E.)
No Monuments known.