British Museum, Bronze Age Guide; Coffey: Bronze Age in Ireland;
Allen: Celtic Art; Abercrombie: Bronze Age Pottery; Wilde: Catalogue
of the Royal Irish Academy's Collection; Allen: Christian Symbolism;
Stokes: Christian Art in Ireland; Petrie: Ecclesiastical Architecture
in Ireland; Coffey: Guide to the Celtic Antiquities of the Christian
Period perserved in the National Museum, Dublin; Kane: Industrial
Resources of Ireland; O'Curry: Manners and Customs of the Ancient
Irish; Coffey: New Grange and other incised Tumuli in Ireland;
Dechelette: Manuel d'Archéologie pré-historique; Ridgeway: Origin of
Currency and Weight Standards.