CRAMOND, Wm. Notes on a Collection of Impressions of Postal Stamps exhibited to the Meeting. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 32, p. 175–178, 1898. DOI: 10.9750/PSAS.032.175.178. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6701. Acesso em: 16 apr. 2024.