Frazer, W. Notes on Incised Sculpturings on Stones in the Cairns of Sliabh-Na-Calliaghe, Near Loughcrew, County Meath, Ireland, With Illustrations from a Series of Ground-Plans and Water-Colour Sketches, by the Late G V Du Noyer,of the Geological Survey of Ireland. PSAS 1893, 27, 294-340.