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Barry O'Reilly, Now You See It, Now You Don't: Irish Legends of Buried Treasure, Béaloideas, Iml. 62/63, Glórtha ón Osnádúr: Páipéir a cuireadh i láthair ag an Siompósium Nordach-Ceilteach / Sounds from the Supernatural: Papers Presented at the Nordic-Celtic Legend Symposium (1994/1995), pp. 199-209
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Barry O'Reilly (1994) studied this question.
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