Heginbottom, J. A. “History of Geology: Karl Baedeker (1801-1859) and George Dawson (1849-1901)”. Geoscience Canada 12, no. 3 (September 9, 1985). Accessed August 17, 2024. https://journals.lib.unb.ca/index.php/GC/article/view/3423.