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Beardmore W.B.XXVI Beardmore W.B.IV Beardmore W.B.III Beardmore W.B.2 Beardmore W.B.V Beardmore W.B.1 Beardmore W.B.VITài liệu tham khảo
WikiPedia: Beardmore W.B.XXVI http://www.flightglobal.com/pdfarchive/view/1925/1... http://www.flightglobal.com/pdfarchive/view/1926/1... http://latvianaviation.com/PNR_Beardmore.html