20.O36 [Marechal Farm and Colombo House, Houthulst Forest] December 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 170. Annotations on recto: north arrow pointing to the right. Annotations on verso: 2 pencilled circles labelled: "MARECHAL FM," and "COLOMBO HO." Placement of annotations corresponds to their exact locations on recto. WWI Aerial Photograph Collection: Box 1, Envelope 28.