(1) Vertical aerial photograph reference number
NMR RAF 540/931 (F20) 4103-5 08-NOV-1952
(2) Externally held archive reference
Burton, R.A. 1989 The Heritage of Exmoor. Barnstaple, R.A.Burton Page(s)72, 232-3
Further information about monuments may be obtained by contacting Archive Services, through the Historic England website.