This is a later copy of an original from 1948, revised to 11th May 1950. It is an office copy. The original was derived from Ordnance Survey of Cornwall sheet LXXXVII.14.
This is part of the Volume: PF/OBL Old Blockhouse, Tresco, Isles of Scilly; within the Series: EHC01/022 English Heritage Plans and Measured Drawings; within the Collection: EHC01 English Heritage(EH):Archive
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