Covers an area equivalent to squares W9, 10, 15 and 16 on the corresponding WWI map sheet 51b. Negative roll 5AL, photo 271. Camera focal length 8 1/4 inches. Annotations on recto: north arrow pointing up. Annotations on verso: "German trenches East of Arras, possibly taken fro the attack on the Canal du Nord" written in pencil. WWI Aerial Photograph Collection: Box 4, Album Photo 42.