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Airco DH.9 Airco DH.4 Airco DH.10 Amiens Airco DH.9A Airco DH.5 Airco DH.2 Airco DH.3 Airco DH.1 Airco DH.11 Air Combat 22Tài liệu tham khảo
WikiPedia: Airco_DH.9A http://www.flightglobal.com/pdfarchive/view/1956/1... http://www.flightglobal.com/pdfarchive/view/1956/1... http://www.theaerodrome.com/aircraft/gbritain/airc... https://commons.wikimedia.org/wiki/Category:Airco_...