@article{Callander_1919, title={Notes on the Roman Remains at Grassy Walls and Bertha, near Perth}, volume={53}, url={http://journals.socantscot.org/index.php/psas/article/view/7456}, DOI={10.9750/PSAS.053.137.152}, journal={Proceedings of the Society of Antiquaries of Scotland}, author={Callander, J}, year={1919}, month={Nov.}, pages={137-152} }