The drawing is by 'IA'. It was most likely made for English Heritage, but this is not stated on the sheet, so copyright is uncertain.
This is part of the Volume: PF/CHY Chysauster Ancient Village, Madron, Cornwall; within the Series: EHC01/022 English Heritage Plans and Measured Drawings; within the Collection: EHC01 English Heritage(EH):Archive
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Iron Age Enclosed Settlement