Bailey, Mark Edward, C. John Butler, James Finnegan, and Shane T. Kelly. “The Cut Benchmarks at Armagh Observatory: Marking Two Hundred Years of the Ordnance Survey of Ireland”. Irish Geography 56, no. 2 (November 4, 2024). Accessed December 11, 2024. https://irishgeography.ie/index.php/irishgeography/article/view/1496.