20.O18 [Milieau Chateau, Houthulst Forest Region] January 3, 1918
Covers an area equivalent to squares O18 and 24 and P13 and 19 on the corresponding WWI map sheet 20. Annotations on recto: north arrow pointing to the left. "Milieau Chateau" printed in white. WWI Aerial Photograph Collection: Box 1, Envelope 106.