20.O36 [Marechal Farm, Houthulst Forest] December 26, 1917, c.5
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 208. Fifth copy of photo 208 in Box 1, Envelope 64 but with different annotations. Annotations on recto: north arrow pointing to the left. "MARACHAL Fm" [correct spelling is "MARECHAL"] printed in red ink. WWI Aerial Photograph Collection: Box 2, Envelope 33.