20.X2 [Bomb Dropping Over Roulers] September 21, 1917
Covers an area equivalent to squares Q36, R31 and 32, W5, 6 and 12 and X1 and 2 on the corresponding WWI map sheet 20. Negative roll 55i, photo 1192. Annotations on recto: north arrow pointing to the upper-right. Annotations on verso: "BOMB DROPPING WEST OF ROULERS" printed in pencil. Number 5 circled in pencil. WWI Aerial Photograph Collection: Box 2, Envelope 32.