20.O35 [Carrefour Richelieu to Lefebvre Cross Roads, Houthulst Forest] December 18, 1917
Covers an area equivalent to portions of squares O35 and 36 on the corresponding WWI map sheet 20. Negative roll 9B, photo 189. Annotations on recto: north arrow pointing to the right. Annotations on verso: pencilled circle labelled, "CHAT." Pencilled polygon labelled, "new track." Placement of annotations on verso corresponds to their exact locations on recto. WWI Aerial Photograph Collection: Box 1, Envelope 48.