| Unidentified photographer/creator Aerial reconnaissance photograph of Passchendaele 1917, 5 December Book illustration, from Gelatin silver print LL/36375 Source:
Col. Terrence J. Finnegan, USAF (Ret.) Shooting the Front: Allied Aerial Reconnaissance and Photographic Interpretation on the Western Front--World War I (Washington, DC: National Defense Intelligence College, 2006)
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