Glass slides marked as being taken by E. Neil Baynes,
C.N.J., [?Cyril N. Jones of Penrhos Llangefni]
Griffith [ ?J.E. Griffith 'A Portfolio of Photographs of the Cromlechs of Anglesey' Bangor 1900]
Norman [?Mrs. Norman Wilcox of Nyth y Wylan Tyn y Gongl].
Slides of sketches are taken from the Archaeological Journal, Archaeologia Cambrensis, Mona Antiqua Restaurata by The Reverend Henry Rowlands published in 1766 and The Reverend John Skinner's Tour of Anglesey, Arch. Cam. Sup. 1908.