-, -. “Extract of a Letter from the Councillor of State, C C Rafn, Secretary of The Royal Society of Northern Antiquaries, Copenhagen, to J M Mitchell”. Proceedings of the Society of Antiquaries of Scotland 2 (November 30, 1856): 100-101. Accessed March 4, 2024. http://journals.socantscot.org/index.php/psas/article/view/4400.