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Gearing (lớp tàu khu trục) Gehringiini Gering GeringswaldeTài liệu tham khảo
WikiPedia: Gearing (lớp tàu khu trục) http://www.destroyersonline.com/usndd/sumnrasbuilt... http://www.gyrodynehelicopters.com/fram.htm http://www.gyrodynehelicopters.com/gearing_class.h... http://www.gyrodynehelicopters.com/gyrodyne_today.... http://www.gyrodynehelicopters.com/qh-50c1.htm http://destroyerhistory.org/sumner-gearingclass/ge... http://www.globalsecurity.org/military/systems/shi... http://www.navsource.org/archives/05/helpers/fram.... http://www.navsource.org/archives/05idx.htm https://web.archive.org/web/20090219202357/http://...