57c.G31 [Resurrection Trench and other defences surrounding Irles] November 9, 1916
Oblique angle photo looking north. Covers an area equivalent to squares G25, 26, 31 and 32 on the corresponding WWI map sheet 57c. Annotations on recto: photo is annotated with numbers from 1 to 21 which correspond to features described in a legend at the bottom of the photo. WWI Aerial Photograph Collection: Box 3, Envelope 158.