20.O35 [Houthulst Forest, Ypres Salient] December 18, 1917
Covers an area equivalent to portions of squares O35 and 36 and U5 and 6. Site of German huts in Houthulst Forest between Panama House and Colombo House. Negative roll 9B, photo 186. Annotations on recto: north arrow pointing to upper-left. WWI Aerial Photograph Collection: Box 3, Envelope 35.