Irish Pedigrees; or, The Origin and Stem of the  Irish Nation.  Dubbin: M'Glashan & Gill, 1876.  First Edition. Pp xxvii, 411. Green cloth boards, title in gilt to spine, covers ruled in blind, emblem in gilt to centre of upper board. Covers lightly worn, inner hinge cracked but firm, contents in good condition.

The first series of O'Hart's magnum opus on Irish genealogy. A second series followed in 1878 and in 1884 he published a supplement to his Irish Pedigrees entitled 'Anglo-Irish Landed Gentry' containing 257 additional genealogies of Anglo-Irish and Anglo-Norman families that settled in Ireland following the English invasion.