¹³Macalister, R. A. S., and R. Lloyd Praeger. “Report on the Excavation of Uisneach.” Proceedings of the Royal Irish Academy. Section C: Archaeology, Celtic Studies, History, Linguistics, Literature 38 (1928): 71, 81. http://www.jstor.org/stable/25515935.
The author also commented about the Survey Letters (p. 71) : "In fact, having regard to the almost superstitious veneration for the Survey Letters, current among a public that has never had the disillusionizing experience of comparing them with the monuments which they profess to describe, it is well to state that the description of the surface aspect of Uisneach which they contain is of very little value."