Survey of London: Volume 13, St Margaret, Westminster, Part II: Whitehall I. Originally published by London County Council, London, 1930.
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'Plate 62: No. 1 Horse Guards Avenue, doorways', in Survey of London: Volume 13, St Margaret, Westminster, Part II: Whitehall I, ed. Montagu H Cox, Philip Norman (London, 1930), British History Online https://prod.british-history.ac.uk/survey-london/vol13/pt2/plate-62 [accessed 14 March 2025].
'Plate 62: No. 1 Horse Guards Avenue, doorways', in Survey of London: Volume 13, St Margaret, Westminster, Part II: Whitehall I. Edited by Montagu H Cox, Philip Norman (London, 1930), British History Online, accessed March 14, 2025, https://prod.british-history.ac.uk/survey-london/vol13/pt2/plate-62.
"Plate 62: No. 1 Horse Guards Avenue, doorways". Survey of London: Volume 13, St Margaret, Westminster, Part II: Whitehall I. Ed. Montagu H Cox, Philip Norman (London, 1930), British History Online. Web. 14 March 2025. https://prod.british-history.ac.uk/survey-london/vol13/pt2/plate-62.
In this section
NO. 1 HORSE GUARDS AVENUE (p. 155)
(a) DOORWAY BETWEEN ROOMS NOS. 18 AND 19.

doorway between Rooms Nos. 18 and 19
(b) DOORWAY TO ROOM NO. 17

doorway to Room No. 17