The "Motif-Index of Early Irish Literature" by Tom Peete Cross is a valuable resource for those interested in folklore and its origins. Published in 1952 by Indiana University Press, this paperback book provides a comprehensive index of motifs found in early Irish literature. Authored by Tom Peete Cross, the book offers insights into the themes and stories prevalent in the folklore of Ireland, making it a key piece for scholars and enthusiasts of Irish literature and culture.