20.O36 [Panama House, Houthulst Forest] December 18, 1917
Covers portions of squares O35 and 36 and U5 and 6 on the corresponding WWI map sheet 20. Negative roll 9B, photo 186. Annotations on recto: north arrow pointing to the upper-left. Annotations on verso: "PANAMA HOUSE" printed and circled in pencil. Placement of annotation corresponds to its exact location on recto. WWI Aerial Photograph Collection: Box 3, Envelope 36.