20.P31 [Six Roads, Houthulst Forest] January 3, 1918
Covers an area equivalent to squares P31 and 32 and V1 and 2 on the corresponding WWI map sheet 20. Negative roll 9B, photo 331. Annotations on recto: north arrow pointing to the upper-left. "Six Roads" printed in white. WWI Aerial Photograph Collection: Box 1, Envelope 110.