20.O33 [Duplex Wood and la Kasbah East of Bultehoek] December 26, 1917
Covers an area equivalent to square O33 on the corresponding WWI map sheet 20. Negative roll 9B, photo 229. Duplex Wood visible as dark area along right edge of photo. Annotations on recto: north arrow pointing to the left. WWI Aerial Photograph Collection: Box 1, Envelope 89.