(1) Vertical aerial photograph reference number
NMR OS/73109 924-25 29-MAR-1973
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(2) Externally held archive reference
Orwin, C.S. 1929 "The Reclamation of Exmoor Forest" Oxford University Press, London page(s) 32-33
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(3) Externally held archive reference
Riley, H and Wilson-North, R 2004 "The Field Archaeology of Exmoor" English Heritage, Swindon page(s) 138-39
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