20.O35 [Panama House, Houthulst Forest] December 18, 1917
Covers an area equivalent to squares O35 and U5 on the corresponding WWI map sheet 20. Negative roll 9B, photo 193. Annotations on recto: north arrow pointing to the right. Annotations on verso: pencilled circle labelled "PANAMA HO." Placement of annotation corresponds to its exact location on recto. WWI Aerial Photograph Collection: Box 1, Envelope 50.