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Douglas MacArthur Douglas Costa Douglas A-4 Skyhawk Douglas A-26 Invader Douglas A-1 Skyraider Douglas A-3 Skywarrior Douglas DC-3 Douglas Aircraft Company Douglas A-20 Havoc Douglas EngelbartTài liệu tham khảo
WikiPedia: Douglas_C-1 http://www.nationalmuseum.af.mil/factsheets/factsh... http://www.nationalmuseum.af.mil/factsheets/factsh... http://www.nationalmuseum.af.mil/factsheets/factsh... http://www.nationalmuseum.af.mil/factsheets/factsh... http://www.nationalmuseum.af.mil/factsheets/factsh... https://commons.wikimedia.org/wiki/Th%E1%BB%83_lo%...