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SMS Helgoland (1909) Tham khảoThực đơn
SMS Helgoland (1909) Tham khảoLiên quan
SMS SMS Seydlitz SMS Von der Tann SMS Goeben SMS Moltke (1910) SMS Helgoland (1909) SMS Rheinland SMS Friedrich der Große (1911) SMS König SMS Kaiser (1911)Tài liệu tham khảo
WikiPedia: SMS Helgoland (1909) https://archive.org/details/brotherhoodofsea00schw https://archive.org/details/warmutinyrevolut00stum https://www.worldcat.org/oclc/22101769 https://www.worldcat.org/oclc/57447525 https://www.worldcat.org/oclc/57239454 https://www.worldcat.org/oclc/77797289 https://www.worldcat.org/oclc/48527933 https://www.worldcat.org/oclc/145747783 https://www.worldcat.org/oclc/13792782 https://www.worldcat.org/oclc/64555761