franks, norman; guest, russell; alegi, gregory. above war fronts: british two-seater bomber pilot , observer aces, british two-seater fighter observer aces, , belgian, italian, austro-hungarian , russian fighter aces, 1914–1918: volume 4 of fighting airmen of wwi series: volume 4 of air aces of wwi. grub street, 1997. isbn 1-898697-56-6, isbn 978-1-898697-56-5.
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