“Notice of the Gun Flint Manufactory at Brandon, with Reference to the Bearing of its Processes upon the Modes of Flint-working Practised in Prehistoric Times: (With Illustrative Examples of the Tools and Specimens of the Manufacture.)” (1887) Proceedings of the Society of Antiquaries of Scotland, 21, pp. 206–212. doi:10.9750/PSAS.021.206.212.