20.O36 [Marechal Farm, Houthulst Forest] November 18, 1917
Covers an area equivalent to portions of squares O36, P31, U6 and V1 on the corresponding WWI map sheet 20. Negative roll 9B, photo number 176. Annotations on recto: north arrow pointing to the left. Annotations on verso: 2 pencilled circles labelled: "MARECHAL FM" and "Missdated..." Placement of annotations corresponds to their exact locations on recto. WWI Aerial Photograph Collection: Box 1, Envelope 33.