Kerr, Andrew. “Classic Rock Tours 4. Long Walks, Lost Documents and the Birthplace of Igneous Petrology: Exploring Glen Tilt, Perthshire, Scotland”. Geoscience Canada 47, no. 1 and 2 (July 10, 2020): 83–102. Accessed November 23, 2024. https://journals.lib.unb.ca/index.php/GC/article/view/31129.