Barclay GJ, Morris R. The anti-invasion defences of the Forth and Tay estuaries, eastern Scotland: 1900 to 1919. PSAS [Internet]. 2019 Nov. 30 [cited 2024 Nov. 22];148:283-331. Available from: https://journals.socantscot.org/index.php/psas/article/view/10266