51b.Q23 [Canal du Nord Near Oisy-le-Verger and the Bois-de-Quesnoy] September 20, 1918
Oblique angle photo looking northeast. Covers the area between squares Q13 and 23 on the corresponding WWI map sheet 51b. Negative roll 5AL, photo 142. Camera focal length 10 1/4 inches. Annotations on recto: "Bois-de-Quesnoy" and "Oisy-le-Verger" labelled in blue ink. An "x" in blue ink at map reference "51b.Q.23.b.20.60." WWI Aerial Photograph Collection: Box 4, Album photo 65.