20.P25 [Marseille Farm, Houthulst Forest] January 3, 1918
Covers an area equivalent to portions of squares O30, 36 and P25, 31 on the corresponding WWI map sheet 20. Negative roll 9B, photo number 317. Annotations on recto: north arrow pointing up. Double dashed white lines. "Marseille Fm" with white arrow pointing to its location. WWI Aerial Photograph Collection: Box 1, Envelope 101.