Hutcheson, Alexander. “Notices (1) of an Ancient Canoe Found in the River Tay, Near Errol; (2) a Grinding-Stone Found on the Sidlaw Hills; (3) a Beggar’s Badge of Sixteenth Century Found in Dundee; And (4) a Spear-Head of Flint Found in the Carcass of a Whale – Being Recent Add”. Proceedings of the Society of Antiquaries of Scotland, vol. 31, Nov. 1897, pp. 265-81, doi:10.9750/PSAS.031.265.281.