(1) Vertical aerial photograph reference number
NMR OS/73087 622-23 17-APR-1973
(2) Externally held archive reference
Orwin, C.S. 1929 "The Reclamation of Exmoor Forest" London, Oxford University Press, page(s) 32-33
Further information about monuments may be obtained by contacting Archive Services, through the Historic England website.