Measured survey (scale 1:200) showing pillow mounds on Mynydd Drumau, produced by W.E. Griffiths, C.J. Spurgeon and A.J. Parkinson, dated June/July 1971
Enw Casgliad
Drawings Collection
Cyfrwng
Graphic.
Cychwynnwr
William E. Griffiths, Mr C. Jack Spurgeon, Mr Anthony J. Parkinson
