Covers an area equivalent to squares A17, 18 and 24 on the corresponding WWI map sheet 57b. Negative roll 13LB photo number 4368. Camera focal length 10 inches. Annotations on recto: north arrow pointing to lower-left. Annotations on verso: "S.E. CAMBRAI, Railway System" written in pencil. WWI Aerial Photograph Collection: Box 3, Envelope 3.