On the Age of the Burgs or 'Brochs,' and some other Pre-historic Remains, of Orkney and Caithness

On the Age of the Burgs or ’Brochs,’ and some other Pre-historic Remains, of Orkney and Caithness. (1869). Proceedings of the Society of Antiquaries of Scotland, 7, 56-100. https://doi.org/10.9750/PSAS.007.56.100