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Survey of London: Volume 16, St Martin-in-The-Fields I: Charing Cross. Originally published by London County Council, London, 1935.
This free content was digitised by double rekeying and sponsored by English Heritage. All rights reserved.
Citation:
HORSE GUARDS. DRAWING SHOWING ALTERNATIVE TREATMENTS OF GUARD BOXES (p. 13)

The proposed Horse Guards, alternative treatments of Guard Boxes