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WikiPedia: Echo_(lớp_tàu_ngầm) https://books.google.com/books?id=l-DzknmTgDUC&pg=... https://books.google.com/books?id=l-DzknmTgDUC&pg=... https://aad.archives.gov/aad/createpdf?rid=210066&... http://www.deepstorm.ru/DeepStorm.files/45-92/nsrs... http://www.deepstorm.ru/DeepStorm.files/45-92/nsrs... http://ship.bsu.by/main.asp?id=102191 http://ship.bsu.by/main.asp?id=102192 https://fas.org/nuke/guide/russia/theater/659.htm https://tools.wmflabs.org/geohack/geohack.php?lang... https://tools.wmflabs.org/geohack/geohack.php?lang...