Barnard, J.G. Notes on sea-coast defence : Consisting of sea-coast fortification, the fifteen-unch gun, and casemate embrasures / by major J.G. Barnard; J.G. Barnard .— : D. van Nostrand, 1861 .— 105 с. — Lang: eng .— URL: https://rucont.ru/efd/94466 (дата обращения: 11.12.2025)